Power Mirror Control Unit Input Test/Replacement

NOTE: Before testing, troubleshoot the multiplex integrated control system first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Turn the ignition switch to LOCK (0).
Remove the driver's door panel (see FRONT DOOR PANEL REMOVAL/INSTALLATION ).
Disconnect the 24P connector (A) from the power mirror control unit (B).

Fig 1: Identifying 24P Connector And Power Mirror Control Unit
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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.

Reconnect the connector to the power mirror control 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, go to step 6.

TEST CONDITION CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
2	GRN	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. C11 (7.5 A) fuse in the driver's under-dash fuse/relay box 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. B16 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
15	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 ground wire
12 . 11	PUR . PNK	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. C26 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty power mirror switch An open or high resistance in the wire
5 . 4	LT BLU . GRY	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. C26 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty power mirror switch An open or high resistance in the wire
3	RED	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. C26 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty power mirror switch An open or high resistance in the wire
6	YEL	Move left or right mirrors	Measure the voltage to ground: There should be about 5 V.	Faulty mirror position sensor A short to ground in the wire
9 . 7	PNK . LT GRN	Swing the left mirror from full left to full right	Measure the voltage between terminals No. 9 and No. 7: There should be about 0.5 V to 4.5 V (average about 2.5 V when the mirror moves).	Faulty left mirror position sensor An open or high resistance in the wire A short to ground in the wire
8 . 7	PUR . LT GRN	Move the left mirror from full up to full down	Measure the voltage between terminals No. 8 and No. 7: There should be about 0.5 V to 4.5 V (average about 2.5 V when the mirror moves).	Faulty left mirror position sensor An open or high resistance in the wire A short to ground in the wire
17 . 7	BLU . LT GRN	Swing the right mirror from full left to full right	Measure the voltage between terminals No. 17 and No. 7: There should be about 0.5 V to 4.5 V (average about 2.5 V when the mirror moves).	Faulty right mirror position sensor An open or high resistance in the wire A short to ground in the wire
18 . 7	ORN . LT GRN	Move the right mirror from full up to full down	Measure the voltage between terminals No. 18 and No. 7: There should be about 0.5 V to 4.5 V (average about 2.5 V when the mirror moves).	Faulty right mirror position sensor An open or high resistance in the wire A short to ground in the wire

Turn the ignition switch to LOCK (0).

Disconnect the connectors from the power mirror control 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 power mirror control unit must be faulty; replace it.

TEST CONDITION CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
24	GRY	Disconnect power seat control unit B (40P) connector	Check for continuity between terminal No. 24 (GRY) and power seat control unit B (40P) connector terminal No. 23 (GRY): There should be continuity.	An open in the UART wire
23 . 22	RED . LT GRN	Under all conditions	Connect terminals No. 23 and No. 13, and terminals No. 22 and No. 15 with jumper wires: The left mirror should move up.	Faulty left mirror actuator An open or high resistance in the wire
23 . 22	RED . LT GRN	Under all conditions	Connect terminals No. 22 and No. 13, and terminals No. 23 and No. 15 with jumper wires: The left mirror should move down.
21 . 22	BLU . LT GRN	Under all conditions	Connect terminals No. 22 and No. 13, and terminals No. 21 and No. 15 with jumper wires: The left mirror should swing left.	Faulty left mirror actuator An open or high resistance in the wire
21 . 22	BLU . LT GRN	Under all conditions	Connect terminals No. 21 and No. 13, and terminals No. 22 and No. 15 with jumper wires: The left mirror should swing right.
10 . 20	BRN . WHT	Under all conditions	Connect terminals No. 10 and No. 13, and terminals No. 20 and No. 15 with jumper wires: The right mirror should move up.	Faulty right mirror actuator An open or high resistance in the wire
10 . 20	BRN . WHT	Under all conditions	Connect terminals No. 20 and No. 13, and terminals No. 10 and No. 15 with jumper wires: The right mirror should move down.
19 . 20	RED . WHT	Under all conditions	Connect terminals No. 20 and No. 13, and terminals No. 19 and No. 15 with jumper wires: The right mirror should swing left.	Faulty right mirror actuator An open or high resistance in the wire
19 . 20	RED . WHT	Under all conditions	Connect terminals No. 19 and No. 13, and terminals No. 20 and No. 15 with jumper wires: The right mirror should swing right.