Immobilizer-Keyless Control Unit Input Test

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.

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

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

Cavity	Wire	Terminal name	Test condition	Test: Desired result	Possible cause if desired result is not obtained
4	GRN	B-CAN	Disconnect the gauge control module 32P connector	Check for continuity between the terminal No. 4 and the gauge control module 32P connector terminal No. 17: There should be continuity.	An open in the B-CAN wire
4	GRN	B-CAN	Disconnect under-dash fuse/relay box connector Q(16P)	Check for continuity between the terminal No. 4 and under-dash fuse/relay box connector Q (16P) terminal No. 3: There should be continuity.	An open in the B-CAN wire
3	GRN	S-NET	Disconnect PCM connector A (49P) (see HOW TO TROUBLESHOOT CIRCUITS AT THE PCM CONNECTORS )	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 under-dash fuse/relay box An open in the S-NET wire
			Disconnect PCM connector A (49P) (see HOW TO TROUBLESHOOT CIRCUITS AT THE PCM CONNECTORS )	Check for continuity between the terminal No. 3 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: After replacing the immobilizer-keyless control unit, do the immobilizer registration (see IMMOBILIZER KEY REGISTRATION ).

Cavity	Wire	Terminal name	Test condition	Test: Desired result	Possible cause if desired result is not obtained
1	PNK	+ B BACK UP	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 1 (15 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
2	RED	IG1	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. 20 (15 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
6	GRY	KEYSW	Ignition key inserted into the ignition switch	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G502) or an open in the ground wire Faulty ignition key switch 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.	Poor ground(G101)or an open in the ground wire An open or high resistance in the wire
5	BLU	K-LINE	Under all conditions	Measure the voltage to ground: There should be 9-12V.	Faulty control unit on the K-line A short to ground in the K-line wire