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

Fig 1: Identifying Immobilizer-Keyless Control Unit 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.

IMMOBILIZER-KEYLESS CONTROL UNIT INPUT TEST RESULT

Cavity	Wire	Terminal name	Test condition	Test: Desired result	Possible cause if desired result is not obtained
2	PUR	IMOCD (S-NET)	Disconnect PCM connector A (49P) (see PCM POWER AND GROUND CIRCUIT TROUBLESHOOTING )	Measure the voltage to ground: There should be about 5 V.	An open or high resistance in the wire A short to ground in the wire
			Disconnect the battery negative terminal	Measure the resistance between the 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 or high resistance in the wire
			Disconnect PCM connector A (49P) (see PCM POWER AND GROUND CIRCUIT TROUBLESHOOTING )	Check for continuity between the terminal and PCM connector A (49P) terminal No. 46: There should be continuity.	An open or high resistance in the wire
3	LT BLUE	K-LINE	Under all conditions	Check for continuity between terminal No. 3 and data link connector (DLC) 16P terminal No. 7: There should be continuity.	An open in the K-LINE wire
3	LT BLUE	K-LINE	Under all conditions	Check for continuity to ground: There should be no continuity.	A short to ground in the K-LINE 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-keyless control unit registration (see IMMOBILIZER KEY REGISTRATION ).

IMMOBILIZER-KEYLESS CONTROL UNIT INPUT TEST RESULT

Cavity	Wire	Terminal name	Test condition	Test: Desired result	Possible cause if desired result is not obtained
7	GRN	VBU	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. B16 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
6	YEL	IG1	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. C21 (20 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
1	BRN	LG3	In all ignition switch positions	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