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Fig. 12 Enthusiast Seat±AG and AJ Body

Fig. 13 Seat Wing Switch Continuity

POWER MEMORY SEAT, RECLINER AND MIRRORS

AC & AY Body vehicles have, as an option, a special 2 position memory power seat, recliner and memory power outside rear view mirror system. Each of the components can be moved to a desired position by operating switches (Fig. 15). The seat and recliner use potentiometers as position sensors and the mirrors use rheostats to send their positioning information back to the control module in the driver's seat. After the desired seat and mirror position is set. The

POWER SEATS 8R - 7

Fig. 14 Lumbar Switch Continuity

seat, recliner, and mirror position can be memorized at any time by pressing and release the Set button. Followed by pressing the Position 1 or 2 button, for the specific position desired. DO NOT press any other seat related switch for at least 5 seconds. However, for the driver to recall a position, the vehicle must not be moving and the seat belt must NOT be buckled. Refer to the Owners Manual supplied with the vehicle for complete instructions on system operation.

Fig. 15 Memory Seat Switch

8R - 8 POWER SEATS

SYSTEM SOFT LIMITS

This portion of the system becomes activated when the control module must shut off a specific seat, recliner or mirror motor because it has reached the end of its travel. When a mechanical stall condition is detected, the control module will set a soft limit in its memory and will not allow the motor to be driven past that point.

To override the soft limits, activate the seat or recliner switch twice in the desired direction holding the switch activated until the end of travel has been reached. Reactivate and hold the switch once more for three seconds. This will cause new soft limits to be set in the control module.

SETTING SYSTEM SOFT LIMITS

If the control module or motor assemblies have been replaced, the control module must learn its new soft limits. To do this, perform the memory seat diagnostic self-test. After the tests are completed, the control module will have learned and memorized its new soft limits.

TEST PROCEDURES

Before any testing is attempted, the battery should be carefully charged and all connections and terminals cleaned and tightened to insure proper continuity and grounds.

MEMORY SEAT AND MIRROR DIAGNOSTIC SELF-TESTS

The system has a built-in set of three self-tests which check all components in the system while giving a visual feedback.

To enter the first self-test mode, switch test, press memory position 1 and 2 buttons, hold for at least five seconds and no longer than ten seconds. Follow this immediately by pressing the Set button and hold for at least five seconds but less than ten seconds. Three seconds after the button is released, the seat, recliner and mirrors will move to a mid-travel position. Within ten seconds, press and release a seat button to activate a seat or recliner motor. All switches except the mirror switches may now be tested one at a time. The memory switches, Position 1 and 2 and Set buttons, may also be tested. A good switch contact actuation will NOD the seat. The seat nod consists of seat front up and seat track forward followed by seat front down and seat track rearward. The nod also includes both outside power rear view mirrors operating in the vertical plane. The system will continue NODDING for good switches until 10 seconds pass without any switch actuation.

Within 10 seconds of the last seat nod, press memory position 1 and 2 buttons for at least 5 seconds but less than 10 seconds, and then release. The seat will move, after 3 seconds, to a full down and rearward position.

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This is the seat check mode. The control module will now move the motors to a stall in forward, rearward, front up, front down, rear up, rear down, recliner forward, and recliner rear ward positions. If a problem exists, the control module will not move that part of the seat. After all motors have been run to stall, the system will pause 3 seconds, then return to the mid-travel position.

The control module will now move the seat through its position for a second run time.

If a problem has been found, the control module will go into a loop and just move the problem part of the system. To exit the loop, press the Set or Position 1 or 2 buttons or repair the fault, i.e.: repair a terminal push out, etc.

When the seat movements are complete, the system will return to its normal operating mode unless memory Position 1 and 2 buttons are held for at least five seconds, but less than ten seconds and then released. The seat will return to its mid-travel position and the mirrors will move full downward and to the left. This is the mirror check mode. The control module will then move the right mirror fully horizontal outboard, and horizontal inboard. This is followed by the left mirror fully horizontal inboard, horizontal outboard, vertical up, and vertical down. Each motor will be driven until the associated mirror plane face has been stalled for up to 1-1/2 seconds at each end of travel. If the control module encounters a problem with any position sensing rheostat that is connected to each motor, that particular motor will not be actuated. After another three second pause, the control module will again try running the mirror motors in the directions given above plus the right mirror vertical up and vertical down. Any motor that has no problem will run for two seconds in each of the given directions.

If a problem is found, the control module will go into a loop and move only the problem part of the system. To exit the loop, repair the fault, or press the Set, Position 1 or 2 buttons. The control module will then finish the motor actuation that are shown above. When the control module has finished, it will return to the normal operating mode after ten seconds if no further switches are activated.

The control module will also return to normal operating mode if any manual seat or recliner movement switch is actuated during the ten second timeout.

If the system has found a problem, refer to the appropriate diagnosis condition.

POWER MEMORY SEAT, RECLINER AND MIRRORS DIAGNOSIS

Before any diagnosis is done on the system, move the seat switches and listen for relays clicking in the control module under the seat. If relays can be heard, the main battery and ground circuits to the control

module as well as the battery circuit to the switches in the driver's door are good.

When checking for voltage or continuity, always use a volt/ohm meter to get accurate readings. The seat and recliner switches must be activated to check for voltage at the seat and recliner motors or at the input to the control module from the switches.

The control module creates a special voltage supply for the position sensing functions. It also shuts down after five seconds, in order to check this or any other voltage being fed back to the control module. A switch may have to be activated more than once to verify a voltage reading. The voltage from the control module that feeds the seat and recliner position sensing potentiometer, will be between 4.5 to 5 volts. For simplicity in the diagnosis section, the feed voltage will be called 5 volts. On the position sensing wires, these voltages will always be less than 5 volts but more than 0 volts. Typically the high level is at a maximum of about 4.25 volts and the low level can be as little as 0.1 volts.

If any seat or recliner potentiometer or mirror rheostat position sense wires are crossed, the control module will not move that part of the system. The seat or mirror will be in a fault diagnostic mode.

CONDITION: SYSTEM WILL NOT OPERATE.

PROCEDURE

(1)Check for forward/rearward operation of recliner. If not operable, check for an open or loose circuit breaker mounted in board on the relay bank in cavity 15.

(2)Check for continuity between 2-way connector under driver's seat and pin 1 at control module 10way connector (Fig. 16 and 17).

(3)Check for continuity between 2-way connector under driver's seat and pin 6 at control module 10way connector.

(4)Check for any movement of the seat by operating the seat switch. If movement the circuit is good into the control module.

(5)No movement check for an open or loose fuse in cavity 15 of the fuse block.

(6)Check for battery voltage to pin 3 of driver's power seat switch.

(7)If battery is good, check for continuity of driver's power seat switch. Refer to Power Memory Seat Switch Continuity (Fig. 16).

(8)Check that all connectors are securely plugged into control module under driver's seat with no terminal push outs.

(9)No correctable faults are found in the above steps. The battery voltage and ground circuits are good into the control module. There is battery voltage through the seat switch to the control module. Then replace the control module.

Fig. 16 Memory Seat Switch Continuity

Fig. 17 Memory Seat Module Connectors

(10) If the control module must be replaced, open it and observe the non-relay side of the printed circuit board. The module may be damaged by an intermittent short on the inside of the recliner switch. If a

Fig. 18 Memory Module Burnt Area

CONDITION: NO RECLINER MOTION FORWARD OR REARWARD AND NO RELAYS CAN BE HEARD CLICKING WHEN THE RECLINER SWITCH IS ACTIVATED.

PROCEDURE

(1)Check for battery voltage at pin 11 of the control module 21-way connector.

(2)Check for battery voltage at pin 3 of the recliner switch connector.

(3)Check for ground at pin 1 of the control module 21-way connector.

(4)Check for ground at both pins 1 and 5 of recliner switch connector. If ground is missing at only one of these pins, repair or replace the seat wiring harness.

(5)If battery voltage and ground are correct to the recliner switch connector, check continuity of the recliner switch. Refer to Left Power Memory Recliner Switch Continuity (Fig. 19).

CONDITION: NO RECLINER MOTION FORWARD, AND A RELAY CAN BE HEARD CLICKING WHEN THE RECLINER SWITCH IS ACTIVATED.

PROCEDURE

(1) Check for battery voltage at pin 2 of the control module 10-way connector with the recliner switch activated.

Fig. 19 Memory Recliner Switch Continuity

(2)Check for ground at pin 4 of the control module 10-way connector with the recliner switch activated.

(3)If battery voltage and ground are NOT present at the above pins of the 10-way connector, replace the control module. If battery and ground are present, then continue procedure.

(4)Check for battery voltage and ground at recliner motor connector in seat.

(5)If recliner motor will not operate, refer to Service Procedure for Recliner Motor and Cable.

CONDITION: NO RECLINER MOTION REARWARD, AND RELAYS CAN BE HEARD CLICKING WHEN THE RECLINER SWITCH IS ACTIVATED.

PROCEDURE

(1)Check for ground at pin 2 of the control module 10-way connector with the recliner switch activated.

(2)Check for battery voltage at pin 4 of the control module 10-way connector with the recliner switch activated.

(3)If battery voltage and ground are NOT present at the above pins of the 10-way connector, replace the control module. If battery and ground are present, then continue procedure.

(4)Check for battery voltage and ground at recliner motor connector in seat.

(5)If recliner motor will not operate, refer to Service Procedure for Recliner Motor and Cable.

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CONDITION: NO RECLINER MANUAL MOVEMENT FORWARD OR REARWARD, RECLINER MOVES IN RECALL MODE ONLY.

PROCEDURE

(1)Check wiring harness in seat between control module and recliner switch for shorted wires to ground or crossed wires. If the ground pins 1 and 5 are in the wrong cavities of the recliner switch connector, the control module may be damaged. Determine the cause and replace the control module after repairing the wiring if necessary.

(2)The recliner moves forward in the recall mode only. Press the recliner switch in the forward direction and check for battery voltage at pin 2 of the recliner switch connector and at pin 5 of the 21-way control module connector.

(3)The recliner moves rearward in the recall mode only. Press the recliner switch in the rearward direction and check for battery voltage at pin 4 of the recliner switch connector and at pin 6 of the 21-way control module connector.

CONDITION: NO RECLINER MOVEMENT IN THE RECALL MODE, RECLINER WILL MOVE MANUALLY WITHOUT STALL DETECTION.

PROCEDURE

(1)Check for 5 volts at pin 9 of the control module 21-way connector (This is the 5 volt feed from the control module to the recliner position sensing resistor).

(2)Check for ground at pin 7 of the 21-way control module connector. To test for ground, one lead of the voltmeter must be connected to the 5 volt supply for the control module. If the sense voltage and ground are NOT present, at the above pins of the 21-way control module connector when the recliner switch is pressed. Replace the control module since an inadvertent application of battery voltage to the circuit could damage the control module. If the circuits are present then continue this procedure.

(3)Check for 5 volts at pin 2 of the black 5-way connector plugged into the recliner motor end-bell.

(4)Check for ground at pin 4 of the black 5-way connector plugged into the recliner motor end-bell.

(5)Unplug the black 5-way connector and observe the male pins for deformation. If deformed, carefully straighten to mate properly with the connector. Carefully reconnect 5-way connector.

(6)Check for a voltage at pin 3 of the black 5-way connector plugged into the recliner motor end-bell with the recliner switch activated. Less than 5 volts when fully forward and more than 0 volts when fully reclined that is variable when the recliner is moving. This is the position sense voltage the control module must have or it will not move the recliner in recall since it has no reference for movement. To test for

POWER SEATS 8R - 11

this voltage, one lead of the voltmeter must be connected to either pin 4 of the black 5-way connector or pin 7 of the 21-way connector. If the above steps have been followed and the voltage is 0, check for a seat wiring harness short to ground of this circuit, repair as necessary, before continuing with this procedure.

(7) Check for the position sense voltage at pin 3 of the control module 21-way connector. If the voltage appears correct, and varies as indicated in step (6) above and there is continuity back to the 5-way connector, then replace the control module.

CONDITION: NO SEAT OR RECLINER MOVEMENT FROM THE MANUAL SWITCHES. SEAT AND RECLINER WILL MOVE IN THE RECALL MODE ONLY.

PROCEDURE

(1)Check for a stuck switch contact in the recliner switch mounted in the driver's left seat side shield. Refer to the Memory Recliner Switch Continuity (Fig. 19).

(2)Check for a stuck switch contact in the driver's power seat switch. Refer to Memory Seat Switch Continuity (Fig. 16).

CONDITION: NO MEMORY RECALL OF SEAT, RECLINER, OR MIRRORS. SEAT, RECLINER, AND MIRRORS WILL MOVE BY MANUAL SWITCH ACTUATION ONLY.

PROCEDURE

(1)Check for a stuck switch contact in the memory switch. Refer to the Memory Switch Continuity (Fig. 20).

(2)Check for battery voltage pin 1 of the memory switch (Fig. 20).

CONDITION: NO MEMORY RECALL OF SEAT, RECLINER, OR MIRRORS TO POSITION 1 ONLY. UNABLE TO ENTER DIAGNOSTIC SELF TEST MODES. POSITION 2 RECALL WORKS.

PROCEDURE

(1)Check for continuity of actuated memory position 1 switch. Refer to the Memory Switch Continuity (Fig. 19). If there is continuity, continue with procedure. If not replace switch.

(2)Check for a terminal push out at pin 2 of the memory switch connector.

(3)Check for battery voltage at pin 14 of the control module 25-way connector with position 1 switch actuated. If battery voltage is OK. There is no terminal push out, and the connector is properly seated. But no reaction from the control module, manually move the seat to a different position than 2. To insure that the Position 1 is not simply a duplicate of

Fig. 20 Memory Switch Continuity

Position 2. If there is still no reaction of the control module to the actuation of the Position 1 button, then replace the control module.

CONDITION: NO MEMORY RECALL OF SEAT, RECLINER, OR MIRRORS TO POSITION 2 ONLY. UNABLE TO ENTER DIAGNOSTIC SELF TEST MODES. POSITION 1 RECALL WORKS.

PROCEDURE

(1)Check for continuity of actuated memory Position 2 button. Refer to the Memory Switch Continuity (Fig. 20). If there is continuity, continue with procedure. If not replace switch.

(2)Check for a terminal push out at pin 3 of the memory switch connector.

(3)Check for battery voltage at pin 1 of the control module 25-way connector with Position 2 button actuated. If battery voltage OK. There is no terminal push out, and the connector is properly seated. But no reaction from the control module, manually move the seat to a different position than 1. To insure that the position 2 is not simply a duplicate of position 1. If there is still no reaction of the control module to the actuation of the 2 switch, then replace the control module.

CONDITION: ACTUATION OF THE SET BUTTON WILL NOT SET ANY NEW POSITIONS IN MEMORY. UNABLE TO ENTER DIAGNOSTIC SELF TEST MODES. ONLY PREVIOUSLY SET MEMORY POSITIONS CAN BE RECALLED.

PROCEDURE

(1)Check for continuity of actuated memory switch Set button. Refer to the Memory Switch Continuity (Fig. 20). If there is continuity, continue with procedure. If not replace switch.

(2)Check for a terminal push out at pin 4 of the memory switch connector.

(3)Check for battery voltage at pin 2 of the control module 25-way connector with the Set button actuated. If battery voltage is OK, there is no terminal push out, and the connector is properly seated then replace the control module.

CONDITION: NO MEMORY POSITIONS CAN BE RECALLED AND THE MEMORY SEAT DIAGNOSTIC SELF SWITCH CHECK IS THE ONLY PART OF SELF TEST THAT WORKS. THE SEAT MOVES OK WITH MANUAL SWITCH.

PROCEDURE

(1)Check for continuity of the seat belt buckle switch in its unbuckled state. Operate the buckle switch to ensure the contact opens when the seat belt is buckled.

(2)Check for continuity between pin 2 of the 2-way seat belt buckle switch connector, harness side, to ground.

(3)Check for continuity between pin 1 of the 2-way seat belt buckle switch connector, harness side, to pin 13 of the control module 25-way connector.

CONDITION: MEMORY RECALLS CAN BE MADE WHILE THE VEHICLE IS IN MOTION WITH THE SEAT BELT UNBUCKLED.

PROCEDURE

(1) Check for continuity of the circuit between the left side instrument panel blue 16-way connector cavity 9 and pin 7 of the control module 25-way connector. The distance sensor signal can be tested with a volt/ohmmeter at pin 7 of the control module 25-way connector. Turn on the vehicle ignition and check for a 5 volt signal as the vehicle is moved about 3 to 5 feet. If not repair open wiring, terminal push out, bad crimp, drive in distance sensor, etc., as necessary to correct condition. Ensure that the 25-way connector is plugged into the control module securely. Road test vehicle after repairs have been made to ensure that no recalls can occur while moving.