Power Seat Control Unit Input Test/Replacement
Note. SRS components are located in this area. Review the SRS component locations, and precautions and procedures before doing repairs or servicing Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
Scheme 11
- Turn the ignition switch to LOCK (0).
- Remove the driver's seat (see «FRONT SEAT REMOVAL/INSTALLATION»(ref-333588-S11463606232009072100000) ). 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 connectors still disconnected, do these input tests at the following connectors. 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 . WIRE CONDITION TABLE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained B38 GRY Disconnect the power mirror control unit 24P connector Check for continuity between terminal B38 and power mirror control unit 24P connector terminal No. 13: There should be continuity. An open or high resistance in the wire A7 . A17 RED . GRN Under all conditions Connect terminals A1 and A7, terminals A4 and A17: The seat should slide backward. Faulty slide motor An open or high resistance in the wire Connect terminals A1 and A17, terminals A4 and A7: The seat should slide forward. A9 . A11 WHT . GRN Under all conditions Connect terminals A1 and A9, terminals A4 and A11: The seat should recline forward. Faulty recline motor An open or high resistance in the wire Connect terminals A1 and A11, terminals A4 and A9: The seat should recline backward. A6 . A16 PUR . BLU Under all conditions Connect terminals A1 and A6, terminals A4 and A16: The front of seat should move down. Faulty front up-down motor An open or high resistance in the wire Connect terminals A1 and A16, terminals A4 and A6: The front of seat should move up. A2 . A10 YEL . PNK Under all conditions Connect terminals A1 and A2, terminals A4 and A10: The rear of seat should move up. Faulty rear up-down motor An open or high resistance in the wire Connect terminals A1 and A10, terminals A4 and A2: The rear of seat should move down.
- Reconnect the connectors to the power seat control unit, and do these input tests.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If ail the input tests prove OK, the control unit must be faulty; replace it.
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired result is not obtained |
|---|---|---|---|---|
| A4 | BLK | In all ignition switch positions | Measure the voltage to ground: There should be less than 0.2 V. | Poor ground (G503) An open or high resistance in the wire |
| A18 | ||||
| B9 | ||||
| A1 | BLU | Under all conditions | Measure the voltage to ground: There should be battery voltage. | Blown No. 9 (20 A) fuse in the auxiliary under-hood fuse/relay box An open or high resistance in the wire |
| A8 | ORN | Under all conditions | Measure the voltage to ground: There should be battery voltage. | Blown No. 10 (20 A) fuse in the auxiliary under-hood fuse/relay box An open or high resistance in the wire |
| B34 | YEL | Ignition switch ON (II) | Measure the voltage to ground: There should be battery voltage. | Blown No. 10 (7.5 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire |
| B36 | WHT | Under all conditions | Measure the voltage to ground: There should be battery voltage. | Blown No. 23 (10 A) fuse in the under-hood fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire |
| B1 . B7 | GRN . LT GRN | Slide switch in FORWARD position | Measure the voltage between the terminals: There should be less than 0.2 V. | Faulty driver's power seat adjustment switch An open or high resistance in the wire |
| B1 . B24 | GRN . PUR | Slide switch in BACKWARD position | Measure the voltage between the terminals: There should be less than 0.2 V. | Faulty driver's power seat adjustment switch An open or high resistance in the wire |
| B1 . B6 | GRN . LT BLU | Recline switch in FORWARD position | Measure the voltage between the terminals: There should be less than 0.2 V. | Faulty driver's power seat adjustment switch An open or high resistance in the wire |
| B1 . B23 | GRN . WHT | Recline switch in BACKWARD position | Measure the voltage between the terminals: There should be less than 0.2 V. | Faulty driver's power seat adjustment switch An open or high resistance in the wire |
| B1 . B5 | GRN . BLU | Front up-down switch in UP position | Measure the voltage between the terminals: There should be less than 0.2 V. | Faulty driver's power seat adjustment switch An open or high resistance in the wire |
| B1 . B4 | GRN . RED | Front up-down switch in DOWN position | Measure the voltage between the terminals: There should be less than 0.2 V. | Faulty driver's power seat adjustment switch An open or high resistance in the wire |
| B1 . B22 | GRN . PNK | Rear up-down switch in UP position | Measure the voltage between the terminals: There should be less than 0.2 V. | Faulty driver's power seat adjustment switch An open or high resistance in the wire |
| B1 . B3 | GRN . GRY | Rear up-down switch in DOWN position | Measure the voltage between the terminals: There should be less than 0.2 V. | Faulty driver's power seat adjustment switch An open or high resistance in the wire |
| B15 | YEL | Run the power seat motors | Measure the voltage between to ground: There should be about 10 V or more. | Faulty position sensor A short to ground in the wire Faulty power seat control unit |
| B10 . B29 | PNK . ORN | Run the recline motor | Measure the voltage between terminals B10 and B29: There should be about 2.5 V average. | Faulty recline position sensor An open or high resistance in the wire A short to ground in the wire Faulty power seat control unit |
| B11 . B29 | GRY . ORN | Run the slide motor | Measure the voltage between terminals B11 and B29: There should be about 2.5 V average. | Faulty slide position sensor An open or high resistance in the wire A short to ground in the wire Faulty power seat control unit |
| B12 . B29 | WHT . ORN | Run the front up-down motor | Measure the voltage between terminals B12 and B29: There should be about 2.5 V average. | Faulty front up-down position sensor An open or high resistance in the wire A short to ground in the wire Faulty power seat control unit |
| B13 . B29 | BLU . ORN | Run the rear up-down motor | Measure the voltage between terminals B13 and B29: There should be about 2.5 V average. | Faulty rear up-down position sensor An open or high resistance in the wire A short to ground in the wire Faulty power seat control unit |
| B26 | PNK | Transmission range switch in P position | Measure the voltage to ground: There should be less than 0.2 V. | Poor ground (G101) or an open in the ground wire Faulty or improperly adjusted transmission range switch An open or high resistance in the wire |
| Transmission range switch in any other position than P | Measure the voltage to ground: There should be more than 5 V. | Faulty transmission range switch A short to ground in the wire Faulty power seat control unit |
WIRE CONDITION TABLE
Scheme 12
- Turn the ignition switch to LOCK (0).
- Remove the driver's door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(ref-333581-S09178406072009072100000) ).
- Disconnect the 24P connector (A) from the power mirror control unit (B).
- 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 connector still disconnected, do these input tests at the following connector. 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 . WIRE CONDITION TABLE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 13 GRY Disconnect power seat control unit B (40P) connector Check for continuity between terminal No. 13 and power seat control unit B (40P) connector terminal No. 38: There should be continuity. An open or high resistance in the UART wire 14 . 15 GRN . BRN Under all conditions Connect terminals No. 14 and No. 24, and terminals No. 15 and No. 22: The left mirror should move up. Faulty left mirror actuator An open or high resistance in the wire Connect terminals No. 15 and No. 24, and terminals No. 14 and No. 22: The left mirror should move down. 15 . 16 BRN . WHT Under all conditions Connect terminals No. 15 and No. 24, and terminals No. 16 and No. 22: The left mirror should swing left. Faulty left mirror actuator An open or high resistance in the wire Connect terminals No. 16 and No. 24, and terminals No. 15 and No. 22: The left mirror should swing right. 3 . 17 LT BLU . ORN Under all conditions Connect terminals No. 3 and No. 24, and terminals No. 17 and No. 22: The right mirror should move up. Faulty right mirror actuator An open or high resistance in the wire Connect terminals No. 17 and No. 24, and terminals No. 3 and No. 22: The right mirror should move down. 17 . 18 ORN . GRY Under all conditions Connect terminals No. 17 and No. 24, and terminals No. 18 and No. 22: The right mirror should swing right. Faulty right mirror actuator An open or high resistance in the wire Connect terminals No. 18 and No. 24, and terminals No. 17 and No. 22: The right mirror should swing left.
- Reconnect the connector to the power mirror control unit, and do these input tests at the following connector.
- 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.
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired result is not obtained |
|---|---|---|---|---|
| 22 | BLK | In all ignition switch positions | Measure the voltage to ground: There should be less than 0.2 V. | Poor ground (G4011) An open or high resistance in the wire |
| 11 | YEL | Ignition switch ON (II) | Measure the voltage to ground: There should be battery voltage. | Blown No. 10 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire |
| 24 | WHT | Under all conditions | Measure the voltage to ground: There should be battery voltage. | Blown No. 23 (10 A) fuse in the under-hood fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire |
| 1 . 2 | RED . PUR | Ignition switch ON (II), and mirror select switch in LEFT, then mirror down switch pressed | Measure the voltage to ground: There should be battery voltage. | Blown No. 36 (10 A) fuse in the under-dash fuse/relay box Faulty power mirror switch An open or high resistance in the wire |
| 8 . 9 | LT GRN . PNK | Ignition switch ON (II), and mirror select switch in RIGHT, then mirror down switch pressed | Measure the voltage to ground: There should be battery voltage. | Blown No. 36 (10 A) fuse in the under-dash fuse/relay box Faulty power mirror switch An open or high resistance in the wire |
| 10 | GRN | Ignition switch ON (II), and mirror select switch in LEFT or RIGHT, then mirror up switch pressed | Measure the voltage to ground: There should be battery voltage. | Blown No. 36 (10 A) fuse in the under-dash fuse/relay box Faulty power mirror switch An open or high resistance in the wire |
| 4 . 6 | PNK . LT GRN | Swing the left mirror from full left to full right | Measure the voltage between terminals No. 4 and No. 6: There should be about 0.5 V to 4.5 V (average about 2.5V when the mirror moves). | Faulty left mirror position sensor An open or high resistance in the wire A short to ground in the wire |
| 5 . 6 | LT BLU . LT GRN | Move the left mirror from full up to full down | Measure the voltage between terminals No. 5 and No. 6: There should be about 0.5 V to 4.5 V (average about 2.5V when the mirror moves). | Faulty left mirror position sensor An open or high resistance in the wire A short to ground in the wire |
| 20 . 6 | BRN . LT GRN | Swing the right mirror from full left to full right | Measure the voltage between terminals No. 20 and No. 6: There should be about 0.5 V to 4.5 V (average about 2.5V when the mirror moves). | Faulty right mirror position sensor An open or high resistance in the wire A short to ground in the wire |
| 19 . 6 | GRN . LT GRN | Move the right mirror from full up to full down | Measure the voltage between terminals No. 19 and No. 6: There should be about 0.5 V to 4.5 V (average about 2.5V when the mirror moves). | Faulty right mirror position sensor An open or high resistance in the wire A short to ground in the wire |
WIRE CONDITION TABLE
Power Window Master Switch Input Test
Note. Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
Scheme 13
- Turn the ignition switch to LOCK (0).
- Remove the power window master switch (see «POWER WINDOW MASTER SWITCH REPLACEMENT»(ref-333619-S07541619552009072100000) ).
- Disconnect the 37P connector (A) from the power window master switch (B).
- 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 connector still disconnected, do these input tests at the following connector. 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 . WIRE CONDITION TABLE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 4 GRN Under all conditions Connect terminals No. 4 and No. 13: The driving position memory switch indicator 2 should come on. Poor ground (G401) Faulty driving position memory switch An open or high resistance in the wire 6 YEL Under all conditions Connect terminals No. 6 and No. 13: The driving position memory switch indicator 1 should come on. Poor ground (G401) or open in the ground wire Faulty driving position memory switch An open or high resistance in the wire 26 LT BLU Under all conditions Connect terminals No. 26 and No. 13: The driving position memory switch lights should come on. Poor ground (G401) or open in the ground wire Faulty driving position memory switch An open or high resistance in the wire
- Reconnect the connector to the power window master switch, and do these 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 door multiplex control unit must be faulty; replace the power window master switch (see «POWER WINDOW MASTER SWITCH REPLACEMENT»(ref-333619-S07541619552009072100000) ).
Note. After replacing the power window master switch, reset the power window control unit.
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired result is not obtained |
|---|---|---|---|---|
| 32 | BLK | In all ignition switch positions | Measure the voltage to ground: There should be less than 0.2 V. | Poor ground (G401) An open or high resistance in the wire |
| 13 | WHT | Under all conditions | Measure the voltage to ground: There should be battery voltage. | Blown No. 23 (10 A) fuse in the under-hood fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire |
| 16 | LT GRN | Driver position 2 button pressed | Measure the voltage to ground: There should be less than 0.2 V. | Poor ground (G401) Faulty driving position memory switch An open or high resistance in the wire |
| Driver position 2 button released | Measure the voltage to ground: There should be about 5 V. | Faulty driving position memory switch A short to ground in the wire | ||
| 17 | PUR | Driver position 1 button pressed | Measure the voltage to ground: There should be less than 0.2 V. | Poor ground (G401) Faulty driving position memory switch An open or high resistance in the wire |
| Driver position 1 button released | Measure the voltage to ground: There should be about 5 V. | Faulty driving position memory switch A short to ground in the wire | ||
| 19 | ORN | Seat SET button pressed | Measure the voltage to ground: There should be less than 0.2 V. | Poor ground (G401) Faulty driving position memory switch An open or high resistance in the wire |
| Seat SET button released | Measure the voltage to ground: There should be about 5 V. | Faulty driving position memory switch A short to ground in the wire |
WIRE CONDITION TABLE
Scheme 14
Scheme 15
- Remove the driver's door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(ref-333581-S09178406072009072100000) ).
- Disconnect the 10P connector (A) from the driving position memory switch (B).
- Remove the two screws, then remove the switch from the door panel.
- Check for continuity between the terminals in each switch position according to the table below.
- If the continuity is not as specified, replace the switch.
Driver's Power Seat Motor Test
Note. SRS components are located in the area. Review the SRS component locations (see COMPONENT LOCATION INDEX ), and precautions and procedures (see PRECAUTIONS AND PROCEDURES before doing repairs or servicing.
Scheme 16
Scheme 17
Scheme 18
Scheme 19
Scheme 20
- Remove the driver's seat (see «FRONT SEAT REMOVAL/INSTALLATION»(ref-333588-S11463606232009072100000) ).
- Disconnect the 6P and 8P connectors from each power seat motor.
- Test each motor by connecting power and ground according to the tables below. When the motor stops running, disconnect battery power immediately.
- If the motor does not run or fails to run smoothly, replace the appropriate motor.
- Slide motor (see «FRONT SEAT SLIDE MOTOR REPLACEMENT»(ref-333588-S32021841982009072100000) )
- Front up-down motor (see «FRONT SEAT RECLINE MOTOR REPLACEMENT»(ref-333588-S12022139572009072100000) )
- Rear up-down motor (see «FRONT SEAT SLIDE MOTOR REPLACEMENT»(ref-333588-S32021841982009072100000) )
- Recline motor (see «FRONT SEAT RECLINE MOTOR REPLACEMENT»(ref-333588-S12022139572009072100000) )
Note. The front and rear up-down motors are part of the seat frame (see FRONT SEAT FRAME REPLACEMENT ).