Front Passenger's MPCS Unit Input Test/Replacement
- Turn the ignition switch to LOCK (0).
- Remove the front passenger's door panel (see FRONT DOOR PANEL REMOVAL/INSTALLATION ).
- Disconnect front passenger's MPCS unit (A) connectors A (28P) and B (14P).
- 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 connectors still disconnected, 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 CHART
Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A4 GRY Driver's under-dash fuse/relay box connector X (39P) and right rear power window switch 14P connector disconnected Check for continuity between terminal A4 and driver's under-dash fuse/relay box connector X (39P) terminal No. 15, and terminal A4 and right rear power window switch 14P connector terminal No. 2:
There should be continuity.- Faulty passenger's under-dash fuse/relay box
- An open or high resistance in the wire
Check for continuity to ground:
There should be no continuity.- Faulty passenger's under-dash fuse/relay box
- A short to ground in the wire
B2 LT BLU Front passenger's power window switch in AUTO position Check for continuity between the terminals:
There should be continuity.- Faulty front passenger's power window switch
- An open or high resistance in the wire
A24 BLU B2 LT BLU Front passenger's power window switch released Check for continuity between the terminals:
There should be no continuity.- Faulty front passenger's power window switch
- A short to ground in the wire
A24 BLU B13 GRY Front passenger's power window switch in UP position Check for continuity between the terminals:
There should be continuity.- Faulty front passenger's power window switch
- An open or high resistance in the wire
A24 BLU B13 GRY Front passenger's power window switch released Check for continuity between the terminals:
There should be no continuity.- Faulty front passenger's power window switch
- A short to ground in the wire
A24 BLU B11 BRN Front passenger's power window switch in DOWN position Check for continuity between the terminals:
There should be continuity.- Faulty front passenger's power window switch
- An open or high resistance in the wire
A24 BLU B11 BRN Front passenger's power window switch released Check for continuity between the terminals:
There should no continuity.- Faulty front passenger's power window switch
- A short to ground in the wire
A24 BLU B9 WHT Under all conditions Connect battery power to terminal A24 and ground terminal B9. The LED should come on. - Faulty front passenger's power window switch
- Faulty LED
- An open or high resistance in the wire
A24 BLU B10 RED Front passenger's power window switch DOWN Check for continuity between the terminals:
There should be continuity between terminals B10 and A22, and no continuity between terminals B10 and B12.- Faulty front passenger's power window switch
- An open or high resistance in the wire
- A short to ground in the wire
B12 PNK A22 PUR B10 RED Front passenger's power window switch in released Check for continuity between the terminals:
There should be continuity between terminals B10 and B12, and no continuity between terminals B10 and A22.- Faulty front passenger's power window switch
- An open or high resistance in the wire
- A short to ground in the wire
B12 PNK A22 PUR B1 LT GRN Connect terminals B8 and B1 with a jumper wire, and connect terminal B7 to body ground. Check the front passenger's power window motor operation:
The motor should run (the window should go down).- Blown No. 3 (30 A) fuse in the passenger's under-dash fuse/relay box
- Faulty front passenger's power window motor
- An open or high resistance in the wire
B7 BLU Connect terminals B8 and B7 with a jumper wire, and connect terminal B1 to body ground. Check the front passenger's power window motor operation:
The motor should run (the window should go up).- Blown No. 3 (30 A) fuse in the passenger's under-dash fuse/relay box
- Faulty front passenger's power window motor
- An open or high resistance in the wire
- Reconnect the connectors to the front passenger's MPCS unit, 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 the front passenger's MPCS unit and go to step 7.TEST CONDITION AND WIRE REFERENCE CHART
Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A7 BLK In all ignition switch positions Measure the voltage to ground:
There should be less than 0.2 V.- Poor ground (G506)
- An open or high resistance in the ground wire
B14 BLK In all ignition switch positions Measure the voltage to ground:
There should be less than 0.2 V.- Poor ground (G506)
- An open or high resistance in the ground wire
A2 WHT 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
- Faulty passenger's under-dash fuse/relay box
- An open or high resistance in the wire
B8 GRN Under all conditions Measure the voltage to ground:
There should be battery voltage.- Blown No. 22 (70 A) fuse in the under-hood fuse/relay box
- Blown No. 3 (30 A) fuse in the passenger's under-dash fuse/relay box
- Faulty passenger's under-dash fuse/relay box
- An open or high resistance in the wire
B3 GRN Ignition switch ON (II) Measure the voltage to ground:
There should be battery voltage.- Faulty front passenger's MPCS unit
- An open or high resistance in the wire
B6 YEL Under all conditions Measure the continuity to ground:
There should be continuity.- Poor ground (G506) or an open in the ground wire
- Faulty front passenger's MPCS unit
- An open or high resistance in the wire
B5 BLU Ignition switch ON (II) and front passenger's power window motor runs by connecting terminals B8 and B1 with a jumper wire, and connect terminal B7 to body ground. Measure the voltage between terminals B5 and B6:
An analog meter should alternate between 0 V and about 5 V (a digital voltmeter reads about 2.5 V while the window moves).- Blown No. 3 (30 A) fuse in the passenger's under-dash fuse/relay box
- Faulty front passenger's MPCS unit
- Faulty front passenger's power window motor
- An open or high resistance in the wire
B4 ORN Ignition switch ON (II) and front passenger's power window motor runs by connecting terminals B8 and B1 with a jumper wire, and connect terminal B7 to body ground. Measure the voltage between terminals B4 and B6:
An analog meter should alternate between 0 V and about 5 V (a digital voltmeter reads about 2.5 V while the window moves).- Blown No. 3 (30 A) fuse in the passenger's under-dash fuse/relay box
- Faulty front passenger's MPCS unit
- Faulty front passenger's power window motor
- An open or high resistance in the wire
- Reset the power window control unit (see RESETTING THE POWER WINDOW CONTROL UNIT ).