Keyless/Power Door Locks/Security System (MICU) Input Test

WARNING: This page is about a different variant/trim than selected.

NOTE:

Refer to the Electrical Wiring Diagrams for the location of the under-dash fuse/relay box connectors.
Before testing, make sure the No. A29 (10 A) fuse in the under-hood fuse/relay box and the No. B5 (7.5 A) fuse in the under-dash fuse/relay box are OK.
With keyless entry; before testing:
- Make sure the headlights, parking lights, side marker lights, taillights, and horn all work properly.
- Make sure the No. B8 (15 A), No. B9 (15 A), No. B15 (15 A), No. B30 (15 A), No. B32 (15 A), No. B33 (15 A), and No. B41 (20 A) fuses in the under-dash fuse/relay box are OK.
- There are two pairs of fuses in the same circuit (No. B8 and No. B32 fuses, No. B9 and No. B33 fuses, and No. B15 and No. B30 fuses). If one fuse is blown, make sure to check the other fuse in the same circuit. If necessary, replace the blown fuse(s).

Turn the ignition switch to LOCK (0).
Disconnect under-dash fuse/relay box connectors A, B, C, D, N, P, R, S, W, and X - Refer to: Under-Dash Fuse/Relay Box Removal and Installation (KA models with Keyless Access System), or Under-Dash Fuse/Relay Box Removal and Installation (KA KX models without Keyless Access System) .
NOTE: All connector views are shown from wire side of female terminals.

Courtesy of HONDA, U.S.A., 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 are OK, go to step 4.

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 5.

NOTE: These are door lock actuator operation tests for keyless entry.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
P20	BRN	In all ignition switch positions	Check for continuity to ground: There should be continuity.	Poor ground (G502) An open or high resistance in the ground wire
R7	BRN	In all ignition switch positions	Check for continuity to ground: There should be continuity.	Poor ground (G502) An open or high resistance in the ground wire
N10	BLU	Connect terminals D3^* and N10 (or N12), and terminal N12 (or N10) and ground with jumper wires.	Check actuator operation:The driver's door lock actuator should LOCK (or UNLOCK).	Faulty driver's door lock actuator An open or high resistance in the wire
N12	YEL
S3	BLU	Connect terminals D3^* and S3 (or S1), and terminal S1 (or S3) and ground with jumper wires.	Check actuator operation:The front passenger's door lock actuator should LOCK (or UNLOCK).	Faulty front passenger's door lock actuator An open or high resistance in the wire
S1	YEL
B15	BLU	Connect terminals D3^* and B15 (or B11), and terminal B11 (or B15) and ground with jumper wires.	Check actuator operation:The left rear door lock actuator should LOCK (or UNLOCK).	Faulty left rear door lock actuator An open or high resistance in the wire
B11	YEL
B18	BLU	Connect terminals D3^* and B18 (or B9), and terminal B9 (or B18) and ground with jumper wires.	Check actuator operation:The right rear door lock actuator should LOCK (or UNLOCK).	Faulty right rear door lock actuator An open or high resistance in the wire
B9	YEL
B7	GRN	Connect terminals D3^* and B7 with a jumper wire momentarily.	Check actuator operation:The trunk lid release actuatorshould work.	Faulty trunk lid release actuator Poor ground (G701) or an open in the ground wire An open or high resistance in the wire *: Use a fused jumper wire with an appropriate amperage fuse.

Reconnect the connectors to the under-dash fuse/relay box; 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 MICU must be faulty; replace the under-dash fuse/relay box - Refer to: Under-Dash Fuse/Relay Box Removal and Installation (KA models with Keyless Access System), or Under-Dash Fuse/Relay Box Removal and Installation (KA KX models without Keyless Access System) .

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result isnot obtained
A3	BLU	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	An open or high resistance in the wire
D28	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. A29 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
D3	YEL	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. A2-2 (60 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
W6	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G501) An open or high resistance in the ground wire
B32	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G602) An open or high resistance in the ground wire
C27	LT BLU	Hood closed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty security hood switch Poor ground (G401) or an open in the ground wire An open or high resistance in the wire
C27	LT BLU	Hood open	Measure the voltage to ground: There should be about 5 V.	Faulty security hood switch A short to ground in the wire
B40	GRN	Driver's door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's door switch Faulty driver's door switch ground An open or high resistance in the wire
B40	GRN	Driver's door closed	Measure the voltage to ground: There should be about 5 V.	Faulty driver's door switch A short to ground in the wire
B29	LT GRN	Front passenger's door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty front passenger's door switch Faulty front passenger's door switch ground An open or high resistance in the wire
B29	LT GRN	Front passenger's door closed	Measure the voltage to ground: There should be about 5 V.	Faulty front passenger's door switch A short to ground in the wire
B33	BRN	Left rear door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty left rear door switch Faulty left rear door switch ground An open or high resistance in the wire
B33	BRN	Left rear door closed	Measure the voltage to ground: There should be about 5 V.	Faulty left rears door switch A short to ground in the wire
B34	GRY	Right rear door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty right rear door switch Faulty right rear door switch ground An open or high resistance in the wire
B34	GRY	Right rear door closed	Measure the voltage to ground: There should be about 5 V.	Faulty right rear door switch A short to ground in the wire
X8	BLU	Driver's door lock switch in LOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's door lock switch Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
X8	BLU	Driver's door lock switch in neutral or UNLOCK	Measure the voltage to ground: There should be about 5 V.	Faulty driver's door lock switch A short to ground in the wire
X7	GRY	Driver's door lock switch in UNLOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's door lock switch Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
X7	GRY	Driver's door lock switch in neutral or LOCK	Measure the voltage to ground: There should be about 5 V.	Faulty driver's door lock switch A short to ground in the wire
X10	PNK	Driver's door key cylinder switch in LOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's door key cylinder switch Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
X10	PNK	Driver's door key cylinder switch in neutral or UNLOCK	Measure the voltage to ground: There should be about 5 V.	Faulty driver's door key cylinder switch A short to ground in the wire
X9	BRN	Driver's door key cylinder switch in UNLOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's door key cylinder switch Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
X9	BRN	Driver's door key cylinder switch in neutral or LOCK	Measure the voltage to ground: There should be about 5 V.	Faulty driver's door key cylinder switch A short to ground in the wire
W7	YEL	Front passenger's door lock switch in LOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty front passenger's door lock switch Poor ground (G504) or an open in the ground wire An open or high resistance in the wire
W7	YEL	Front passenger's door lock switch in neutral or UNLOCK	Measure the voltage to ground: There should be about 5 V.	Faulty front passenger's door lock switch A short to ground in the wire
W8	PUR	Front passenger's door lock switch in UNLOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty front passenger's door lock switch Poor ground (G504) or an open in the ground wire An open or high resistance in the wire
W8	PUR	Front passenger's door lock switch in neutral or LOCK	Measure the voltage to ground: There should be about 5 V.	Faulty front passenger's door lock switch A short to ground in the wire
X5	LT GRN	Driver's door lock knobswitch in LOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's door lock knob switch Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
X5	LT GRN	Driver's door lock knobswitch in UNLOCK	Measure the voltage to ground: There should be about 5 V.	Faulty driver's door lock knob switch A short to ground in the wire
X4	WHT	Driver's door lock knobswitch in UNLOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's door lock knob switch Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
X4	WHT	Driver's door lock knob switch in LOCK	Measure the voltage to ground: There should be about 5 V.	Faulty driver's door lock knob switch A short to ground in the wire
W10	LT BLU	Front passenger's door lock knob switch in UNLOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty front passenger's door lock knob switch Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
W10	LT BLU	Front passenger's door lock knob switch in LOCK	Measure the voltage to ground: There should be about 5 V.	Faulty front passenger's door lock knob switch A short to ground in the wire
W4	BRN	Left rear door lock knob switch in UNLOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty left rear door lock knob switch Poor ground (G602) or an open in the ground wire An open or high resistance in the wire
W4	BRN	Left rear door lock knob switch in LOCK	Measure the voltage to ground: There should be about 5 V.	Faulty left rear door lock knob switch A short to ground in the wire
W5	BRN	Right rear door lock knob switch in UNLOCK	Measure the voltage to ground: There should be less than 0.2 V.	Faulty right rear door lock knob switch Poor ground (G602) or an open in the ground wire An open or high resistance in the wire
W5	BRN	Right rear door lock knob switch in LOCK	Measure the voltage to ground: There should be about 5 V.	Faulty right rear door lock knob switch A short to ground in the wire
B22	BLU	Trunk lid open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty trunk lid latch switch Poor ground (G701) or an open in the ground wire An open or high resistance in the wire
B22	BLU	Trunk lid closed	Measure the voltage to ground: There should be battery voltage.	Faulty trunk lid latch switch A short to ground in the wire
D23	GRN	Transmission range switch in P	Measure the voltage to ground: There should be less than 0.2 V.	Faulty or improperly adjusted transmission range switch Poor ground (G101) or an open in the ground wire An open or high resistance in the wire
D23	GRN	Transmission range switch in any other position than P	Measure the voltage to ground:There should be about 5 V.	A short to ground in the wire Faulty or improperly adjusted transmission range switch
P11	BRN	Ignition key inserted into the ignition key cylinder	Measure the voltage to ground: There should be less than 0.2 V.	Faulty ignition key switch Poor ground (G503) or an open in the ground wire An open or high resistance in the wire
P11	BRN	Ignition switch LOCK (0), and the ignition key removed from the ignition key cylinder	Measure the voltage to ground: There should be about 5 V.	Faulty ignition key switch A short to ground in the wire
W9	GRN	Under all conditions	Measure the voltage to ground:There should be less than 0.2 V.^*	Faulty audio unit Poor ground (G505) or an open in the ground wire An open or high resistance in the wire *: If the factory-installed audio unit is removed from the vehicle, this voltage will be between 10-12V