Immobilizer-Keyless Control Unit Input Test

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

NOTE:

SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX ), and precautions and procedures (see 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 ).

Remove the steering column covers (see SIDE DEFOGGER VENT TRIM REMOVAL/INSTALLATION ).
Disconnect the 7P connector (A) from the immobilizer-keyless control unit (B).

Fig 1: Identifying Immobilizer-Keyless Control Unit And 7P Connector
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 4.

With the connector 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.

WIRE TEST CONDITION CHART

Cavity	Wire	Terminal name	Test condition	Test: Desired result	Possible cause if desired result is not obtained
3	BLU	B-CAN L	Disconnect the gauge control module 32P connector. Also disconnect driver's under-dash fuse/relay box connector P (20P).	Check for continuity between terminal and gauge control module 32P connector terminal No. 23: There should be continuity.	An open in the B-CAN wire
3	BLU	B-CAN L		Check for continuity between terminal and driver's under-dash fuse/relay box connector P (20P) terminal No. 5: There should be continuity.	An open in the B-CAN wire
4	PNK	B-CAN H	Disconnect the gauge control module 32P connector. Also disconnect driver's under-dash fuse/relay box connector P (20P).	Check for continuity between terminal and gauge control module 32P connector terminal No. 24: There should be continuity.	An open in the B-CAN wire
4	PNK	B-CAN H		Check for continuity between terminal and driver's under-dash fuse/relay box connector P (20P) terminal No. 6: There should be continuity.	An open in the B-CAN wire
6	LT GRN	S-NET	Ignition switch ON (II), disconnect PCM connector A (49P) (see PCM REPLACEMENT )	Measure the voltage to ground: There should be about 5 V.	A short to ground in the wire An open in the wire
			Disconnect the battery negative terminal	Measure the resistance between terminal and body ground: There should be more than 50 kΩ	Faulty imoes unit (built into the MICU) Faulty driver's under-dash fuse/relay box An open in the wire
			Disconnect PCM connector A (49P) (see PCM REPLACEMENT )	Check for continuity between terminal and PCM connector A (49P) terminal No. 46: There should be continuity.	An open in the wire

Reconnect the connector to the immobilizer-keyless 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, replace the immobilizer-keyless control unit (see IMMOBILIZER-KEYLESS CONTROL UNIT REGISTRATION ).

NOTE: If you replace the immobilizer-keyless control unit, do the immobilizer registration (see IMMOBILIZER KEY REGISTRATION ).

WIRE TEST CONDITION CHART

Cavity	Wire	Terminal name	Test condition	Test: Desired result	Possible cause if desired result is not obtained
1	WHT	VBU	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
2	YEL	IG1	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. 9 (20 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
7	BRN	LG	Under all conditions	Measure the voltage to ground: There should be less than 0.2 V.	Faulty PCM ground or PCM Poor ground (G101) or an open in the ground wire An open or high resistance in the wire
5	LT BLU	K-LINE	Ignition switch ON (II)	Measure the voltage to ground: There should be 9-12 V.	Faulty control unit on the K-LINE K-LINE short to ground