Power Seat Control Unit Input Test/Replacement
NOTE:
- SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX ), and the precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before doing repairs or servicing.
- Power Seat Control Unit appears as "MEMORY SEAT CONTROL UNIT" on HDS display screen.
- Turn the ignition switch to LOCK (0).
- Remove the driver's seat (see
FRONT SEAT REMOVAL/INSTALLATION
).NOTE: Be careful not to scratch the interior trim.
- Disconnect the 40P connector (A) and 18P connector (B) from the power seat control unit (C).
- Inspect the connector and socket terminals to be sure they are all making good contact.
- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
- If the terminals look OK, go to step 5.
- With the power seat control unit connectors still disconnected, disconnect power tilt/telescopic steering control unit connector A, and do the following input tests.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, go to step 6.
TEST CONDITION AND WIRE REFERENCE CHARTCavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A39 BLK Under all conditions Check for continuity between the terminal A39 and power tilt/telescopic steering control unit connector A (16P) terminal No. 11. There should be continuity. An open or high resistance in the wire - Reconnect the connectors and do the following input tests.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, the control unit must be faulty; replace it.
TEST CONDITION AND WIRE REFERENCE CHARTCavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A9 BLK In all ignition switch positions Measure the voltage to ground: There should be less than 0.2 V. - Poor ground(G601)
- An open or high resistance in the ground wire
B4 BLK B18 BLK A35 BLK/YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. - Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box
- An open or high resistance in the wire
A37 BLU Under all conditions Measure the voltage to ground: There should be battery voltage. - Blown No. 15 (40 A) fuse in the under-hood fuse/relay box
- Blown No. 7 (10 A) fuse in the driver's under-dash fuse/relay box
- An open or high resistance in the wire
B1 RED Under all conditions Measure the voltage to ground: There should be battery voltage. - Blown No. 20 (40 A) fuse in the under-hood fuse/relay box
- Blown No. 16 (20 A) fuse in the driver's under-dash fuse/relay box
- An open or high resistance in the wire
B8 BLU Under all conditions Measure the voltage to ground: There should be battery voltage. - Blown No. 20 (40 A) fuse in the under-hood fuse/relay box
- Blown No. 14 (20 A) fuse in the driver's under-dash fuse/relay box
- An open or high resistance in the wire
A31 BLK/BLU Shift lever in P Measure the voltage to ground: There should be less than 0.2 V. - Faulty transmission range switch
- Poor ground (G101) or an open in the ground wire
- An open or high resistance in the wire
Shift lever out Off Measure the voltage to ground: There should be at least 5 V. A short to ground in the wire