Immobilizer-Keyless Control Unit Input Test

WARNING: This page is about a different car, the 2012 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.

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 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
3	LT GRN	B-CAN L	Disconnect the gauge control module 32P connector	Check for continuity between terminal No. 3 and gauge control module 32P connector terminal No. 19: There should be continuity.	An open in the B-CAN wire
3	LT GRN	B-CAN L	Disconnect under-dash fuse/relay box connector T (34P)	Check for continuity between No. 3 terminal and under-dash fuse/relay box connector T (34P) terminal No. 29: There should be continuity.	An open in the B-CAN wire
4	WHT	B-CAN H	Disconnect the gauge control module 32P connector	Check for continuity between terminal No. 4 and the gauge control module 32P connector terminal No. 20: There should be continuity.	An open in the B-CAN wire
4	WHT	B-CAN H	Disconnect under-dash fuse/relay box connector T (34P)	Check for continuity between terminal No. 4 and under-dash fuse/relay box connector T (34P) terminal No. 12: There should be continuity.	An open in the B-CAN wire
6	PNK	S-NET	Jump the SCS line with the HDS, disconnect PCM connector A (49P), then turn the ignition switch to ON(II)	Measure the voltage to ground: There should be about 5V.	A short to ground in the wire An open in the S-NET wire
			Disconnect the battery negative terminal	Measure the resistance between terminal No. 6 and body ground: There should be more than 50 kΩ.	Faulty imoes unit (built into the MICU) Faulty MICU An open in the S-NET wire
			Jump the SCS line with the HDS, disconnect PCM connector A (49P)	Check for continuity between terminal No. 6 and PCM connector A (49P) terminal No. 46: There should be continuity.	Faulty imoes unit (built into the MICU) Faulty MICU An open in the S-NET 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 REPLACEMENT ).

NOTE: After replacing the immobilizer-keyless control unit, do the immobilizer key registration (see IMMOBILIZER KEY REGISTRATION ).

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 body ground: There should be battery voltage.	Blown No. 23 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire A short to ground in the wire
2	BRN	IG1	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. 2 (20 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire A short to the ground in the wire
7	BRN	LG3	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 Faulty PCM ground or faulty PCM
5	LT BLU	K-LINE	Under all conditions	Measure the voltage to ground: There should be pulse voltage (digital signal).	Faulty control unit on the K-LINE Short to ground in the K-LINE wire