Файл: 92FWD_8R.pdf

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CONDITION: INSTRUMENT CLUSTER SPEEDOMETER STAYS AT 0 MPH/(0 KM/H) WHILE VEHICLE IS MOVING, BODY COMPUTER DOES NOT LOCK DOORS AT 15 MPH (24 KM/H), AND THE SPEED CONTROL WILL NOT ACCEPT A SPEED SET.

PROCEDURE

(1)Remove driver's seat anchor bolts and nuts. Adjust the driver's seat to a safe driving position. Disconnect the 25-way connector from the memory seat control module. Replace the driver's seat anchor bolts and nuts. Road test the vehicle to complete this diagnosis. If the doors lock, the cruise control accepts a set, and the speedometer now works, replace the Memory Seat control module.

(2)After replacing the Memory Seat control module, perform the memory seat diagnostic self tests. This teaches the new module it's soft limits and now re-road test the vehicle before returning it to the customer.

CONDITION: NO SEAT MOVEMENT IN THE RECALL MODE, SEAT WILL MOVE BY MANUAL SWITCH ACTUATION IN ALL DIRECTIONS WITHOUT STALL DETECTION.

PROCEDURE

(1)Check for 5 volts at pin 10 of the control module 25-way connector. This is the 5 volt feed from the control module to the seat track position sensing potentiometer.

(2)Check for ground at pin 8 of the control module 25-way connector. To test for ground, one lead of the voltmeter must be connected to either the 5 volt supply for the control module or the battery positive. If the sense voltage and ground are NOT present at the above pins of the 21-way control module connector. When the seat switch is pressed, replace the control module. An inadvertent application of battery voltage to the circuit could damage the control module. If the voltage and ground circuits are present then continue this procedure.

(3)Check for 5 volts at pin 5 of the natural 5-way connector plugged into the power seat adjuster motors end-bell.

(4)Check for ground at pin 4 of the natural 5-way connector plugged into the power seat adjuster motors end-bell. If the power seat adjuster still has no movement in the recall mode, then continue this procedure.

(5)Disconnect the natural 5-way connector from the power seat adjuster motors end-bell.

(6)Check with an ohmmeter for a resistance reading that may be from 2600 to 4000 ohms between pins 4 and 5 of the motors end-bell connector. If there is an open circuit reading or the reading obtained falls

POWER SEATS 8R - 13

outside this range, then replace the seat motor package assembly. After replacement of the seat motor package, reconnect all wiring connectors and reinstall seat assembly in vehicle. Operate the switches manually to cause maximum seat movement in all directions. Perform the memory seat diagnostic self check so the control module will learn the new soft limits of the assembly.

CONDITION: NO SEAT TRACK FORWARD OR REARWARD MOVEMENT IN THE RECALL MODE, SEAT TRACK WILL MOVE FORWARD OR REARWARD BY MANUAL SWITCH ACTUATION WITHOUT STALL DETECTION.

PROCEDURE

(1)Check for a voltage at pin 12 of the control module 21-way connector. Less than 5 volts for the seat track fully forward and more than 0 volts when fully rearward. This voltage should vary corresponding to the position.

(2)Check for a voltage at pin 1 of the natural 5-way connector, same as in step (1) above. The ground lead connected to pin 4 of the 5-way connector. If the voltage reading is at 0 volts, disconnect the 5-way natural connector and check for a short to ground in the harness. If no short is found, reconnect the connector and continue the procedure.

(3)Check for the voltage to vary as noted above, if it does not vary as the seat track is moved forward and rearward, the sensing potentiomenter is defective. Replace the seat motor package assembly. After replacement of the seat motor package, reconnect all wiring connectors and reinstall seat assembly in vehicle. Operate the switches manually to cause maximum seat movement in all directions. Perform the memory seat diagnostic self check so the control module will learn the new soft limits of the assembly.

CONDITION: NO SEAT TRACK FRONT UP OR DOWN MOVEMENT IN THE RECALL MODE, SEAT TRACK FRONT WILL MOVE UP OR DOWN BY MANUAL SWITCH ACTUATION WITHOUT STALL DETECTION.

PROCEDURE

(1)Check for a voltage at pin 2 of the control module 21-way connector. Less than 5 volts for the seat track front full up and more than 0 volts when fully down.

(2)Check for a voltage at pin 2 of the natural 5-way connector. Same as in step (1) above. With the ground lead of the meter at pin 4 of this connector. If the voltage reading is at 0 volts, disconnect the 5-way natural connector and check for a short to ground in the harness. If no short is found, reconnect the connector and continue the procedure.

CONDITION: NO MOVEMENT OF THE SEAT, SEAT WILL MOVE IN THE RECALL MODE ONLY.

PROCEDURE

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

(2)Check for continuity of driver's power seat switch. Refer to Memory Seat Switch Continuity (Fig. 19). If switch is good, check for continuity between the driver's door switch and the 25-way connector in the control module in the driver's seat (Figs. 21 and 22).

(3)Use an ohmmeter to test the wiring between the door switch and the control module in the driver's seat. The circuits should be disconnected from their components at each end. Repair the wiring as required for open circuits, terminal push outs, or bad

Fig. 22 Control Module and Seat Switch Pin

Location

crimps. If the circuits are good to the control module but the function is still missing, replace the control module.

CONDITION: NO MOVEMENT OF THE SEAT, RELAYS CAN BE HEARD CLICKING WHEN THE SEAT SWITCH IS ACTIVATED.

PROCEDURE

(1) Check for battery voltage and ground at the appropriate pins of the control module 10-way connector (Fig. 23). If the proper results are not obtained, replace the control module. If the circuits are correct, then continue the procedure.

Fig. 23 Control Module 10-Way Connector Voltage

and Ground Test

(2) Check for continuity of the motor circuits from the control module 10-way connector to the left power seat motor package (Fig. 24).

Fig. 24 Control Module 10-Way Connector to Power Seat Motor Connector Continuity

(3) Repair the wiring as required for open circuits, terminal push outs, or bad crimps. If the circuits are good but the seat movement direction is still missing, replace the seat motor package assembly. After replacement of the seat motor package, reconnect all wiring connectors and reinstall seat assembly in vehicle. Operate the switches manually to cause maximum seat movement in all directions. Perform the memory seat diagnostic self check so the control module will learn the new soft limits of the assembly.

CONDITION: NO MOVEMENT OF THE MEMORY MIRRORS WHEN THE POWER MIRROR SWITCH IS ACTUATED, MEMORY MIRRORS MOVE DURING RECALL ONLY.

PROCEDURE

(1)Check for battery voltage at pin 1 of the memory mirror switch 8-way connector in the driver's door. This battery feed is through a diode package that is located in the left cowl side area. A grounded wire on the switch side of the diode would most likely cause the diode package to open. Solder and tape the connections if replacement is necessary. The fuse is in cavity 13 of the fuse block.

(2)Check for ground at pin 5 of the memory mirror switch 8-way connector. Repair as needed.

(3)Check for continuity of the memory mirror switch. Refer to the Group 8T, Mirror Switch Test Procedure and the Continuity.

CONDITION: NO MOVEMENT OF BOTH MEMORY MIRRORS OR ONLY ONE MEMORY MIRROR DURING THE RECALL MODE, MEMORY MIRRORS WILL MOVE ONLY WHEN THE POWER MIRROR SWITCH IS ACTUATED. MEMORY SEAT AND RECLINER MOVE IN RECALL.

PROCEDURE

(1)Determine the fault precisely. If all memory mirror recall movements appear to be missing, first set the mirrors to two different vertical and horizontal positions for both mirrors. Refer to the General Information paragraph at the beginning of this section for position setting instructions. Try to recall these set positions that were just placed in memory.

(2)Observe for no movement in a specific direction for a specific mirror. If there is still no movement of either mirror in any direction, replace the control module. Perform the memory seat diagnostic self check so the control module will learn the new soft limits of the assembly. If the non-movement is in a specific direction or a specific mirror, continue with the procedure.

(3)Perform the diagnostic self tests, mirror check mode, to determine if the fault is with a motor or

Fig. 25 Control Module 25-Way Connector to Mirror 8-Way Connector Continuity

Repair open wiring, terminal push outs or bad crimps as necessary to correct the fault. If there is still no recall movement of an individual mirror after ensuring continuity of the motor drive circuits, then replace the control module. Perform the memory seat diagnostic self check so the control module will learn the new soft limits of the assembly.

(5) Check for continuity of the position sensing rheostat circuits at the disconnected 25-way connector under the driver's seat. Connect an ohmmeter between the cavities of the 25-way connector as indicated in the charts for the left or right mirrors as required (Fig. 27). If the resistance values cannot be obtained, i.e., an open circuit, continue the procedure.

Fig. 26 Mirror 8-Way Connector and 25-Way Control

Module Connector

Fig. 27 Sensing Rheostat Resistance

(6) Check for continuity of the position sensing rheostat circuits between the control module 25-way connector and the mirror 8-way connector for the left or right mirrors as required (Fig. 28). Repair the

Fig. 28 Sensing Rheostat Continuity

(7)Check for resistance values in the left or right mirror assembly as indicated by the diagnostic self test fault locator. Connect an ohmmeter between the mirror 8-way connector cavities as shown in the chart (Fig. 29). Both left and right mirrors use the same cavities. As the mirror face is moved manually the resistance value will change between the values given in the chart. If these results are not obtained, replace the mirror assembly.

(8)If the resistance values from procedure (5) cannot be obtained and indicate a short to ground or battery, use an ohmmeter is isolate the circuits and components at fault. If the fault is in the wiring harness, repair or replace the wiring harness as necessary. If the fault is in the mirror, replace the mirror assembly.

(9)If after checking the rheostat circuits of an individual mirror and all circuits are correct then replace the control module. Perform the memory seat diagnostic self check so the control module will learn the new soft limits of the assembly.

Fig. 29 Mirror Rheostat Resistance

POWER RECLINER MOTOR AND CABLE

REMOVAL

(1)Remove seat assembly from vehicle, following procedure outlined under Seat Assembly Removal.

(2)Remove seat outboard side shields to expose recliner and cable (Fig. 30).

(3)Remove cable housing clip from cushion frame.

(4)Remove cable housing clamp from the recliner transmission housing, and remove drive cable.

(5)Lay seat on its back on some clean surface.

(6)Remove four bolts, attaching the power seat track to cushion frame.

(7)Remove two motor attachment screws from power seat track cross strap.

(8)Disconnect recliner motor connectors.

(9)Remove recliner motor and cable assembly.

INSTALLATION

(1)Position recliner motor and cable assembly to seat track. Check that the cable is equipped with a cable housing clip and clamp.

(2)Connect wiring connectors.

(3)Install power recliner motor to power seat track front cross strap with two attaching screws (Fig. 30).

(4)Align power seat track with the cushion frame. The power recliner cable housing must be routed toward the recliner through the gap between the cushion frame and the power seat track side strap.

(5)Install the power seat track to the cushion frame.

(6)Install the square drive cable end into the square hole in the drive worm gear at transmission. The cable may have to be rotated manually in order to align properly with the square hole in the drive worm gear.

(7)Position cable housing so that it is properly seated into the transmission housing.

(8)Clamp the cable housing to the transmission housing with the clamp. The prongs of the clamp should be pointing towards the floor of the vehicle.