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.
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 With 7P Connector End View
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
6	LT GRN	S-NET	Disconnect PCM connector A (49P) (see ECM/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 k Ω.	Faulty imoes unit (built into the MICU) Faulty driver's under-dash fuse/relay box An open in the S-NET wire
			Disconnect PCM connector A (49P) (see ECM/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 REPLACEMENT ).

NOTE: If you replace 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	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	LG3	Under all conditions	Measure the voltage to ground: There should be less than 0.2 V.	Faulty 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