Power Mirror Control Unit Input Test/Replacement

NOTE: Before troubleshooting the DPMS, 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), or press the engine start/stop button to select the OFF mode
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 Power Mirror Control Unit And 24P Connector Terminals
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 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

TEST CONDITION INPUT CHART

Cavity	Wire	Test condition	Test Desired result	Possible cause if desired result is not obtained
22	BLK	Under all conditions	Measure the voltage to ground: There should be less than 0.2V	Poor ground (G401) an open in the ground wire An open or high resistance in the wire
11	BRN	Ignition switch ON (II), or power mode ON	Measure the voltage to ground: There should be battery voltage	Blown No 12 (7.5 A) fuse in the driver's 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 15 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
1 2	PNK BLU	Ignition switch ON (II), or power mode ON, and mirror select switch in LEFT, then mirror down switch pressed	Measure the voltage to ground: There should be battery voltage	Blown No 16 (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
8 9	LT BLU GRY	Ignition switch ON (II), or power mode ON, and mirror select switch in RIGHT, then mirror down switch pressed	Measure the voltage to ground: There should be battery voltage	Blown No 16 (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
10	ORN	Ignition switch ON (II), or power mode ON, 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 16 (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
7	LT BLU	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
4 6	YEL 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 4.5V (about 2.5V)	Faulty left mirror position sensor An open in the wire A short to ground in the wire
5 6	PUR 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 4.5V (about 2.5 V)	Faulty left mirror position sensor An open in the wire A short to ground in the wire
20 6	BLU 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 4.5V (about 2.5 V)	Faulty right mirror position sensor An open or high resistance in the wire A short to ground in the wire
19 6	ORN 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 4.5V (about 2.5 V)	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), or press the engine start/stop button to select the OFF mode, then disconnect the connectors from the power mirror control unit, and 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, the control unit must be faulty, replace it

TEST CONDITION INPUT CHART

Cavity	Wire	Test condition	Test Desired result	Possible cause if desired result is not obtained
13	LT GRN	Disconnect power seat control unit B (40P) connector	Check for continuity between terminal No 13(LT GRN)and power seat control unit B (40P) connector terminal No 38 (PUR): There should be continuity	An open or high resistance in the wire
14 15	RED 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
14 15	RED BRN	Under all conditions	Connect terminals No 15 and No 24, and terminals No Hand No 22: The left mirror should move down
15 16	GRN PNK	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
15 16	GRN PNK	Under all conditions	Connect terminals No 16 and No 24, and terminals No 15 and No 22: The left mirror should swing right
3 17	BRN WHT	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
3 17	BRN WHT	Under all conditions	Connect terminals No 17 and No 24, and terminals No 3 and No 22: The right mirror should move down
17 18	WHT PUR	Under all conditions	Connect terminals No 17 and No 24, and terminals No 18 and No 22: The right mirror should swing left	Faulty right mirror actuator An open or high resistance in the wire
17 18	WHT PUR	Under all conditions	Connect terminals No 18 and No 24, and terminals No 17 and No 22: The right mirror should swing right