Immobilizer-keyless Control Unit Input Test

NOTE: 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 driver's dashboard undercover (see DRIVER'S POCKET REMOVAL/INSTALLATION ), then remove the dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION )
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 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 5

With the connector still disconnected, do these input tests at the following connector

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 6

PROBABLE SYMPTOM CHART

Cavity	Wire	Terminal name	Test condition	Test Desired result	Possible cause if desired result is not obtained
3	BLU	B-CAN LO	Disconnect the gauge control module 32P connector	Check for continuity between the terminal and the gauge control module 32P connector No 23 terminal There should be continuity	An open in the wire
3	BLU	B-CAN LO	Disconnect driver's under-dash fuse/relay box connector P (20P)	Check for continuity between the terminal and driver's under-dash fuse/relay box connector P (20P) No 5 terminal There should be continuity	An open in the wire
4	PNK	B-CAN HI	Disconnect the gauge control module 32P connector	Check for continuity between the terminal and the gauge control module 32P connector No 24 terminal There should be continuity	An open in the wire
4	PNK	B-CAN HI	Disconnect driver's under-dash fuse/relay box connector P (20P)	Check for continuity between the terminal and driver's under-dash fuse/relay box connector P (20P) No 6 terminal There should be continuity	An open in the wire
6	LT GRN	IMOCD (S-NET)	Ignition switch ON (II), disconnect ECM/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 the terminal and body ground There should be more than 50 kΩ	Faulty imoes unit Faulty driver's under-dash fuse/relay box An open in the wire
			Disconnect ECM/PCM connector A (49P) (see ECM/PCM REPLACEMENT )	Check for continuity between the terminal and ECM/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 these input tests at the following connector

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 registration (see IMMOBILIZER KEY REGISTRATION )

PROBABLE SYMPTOM 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 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 in the wire
7	BRN	LG	Under all conditions	Measure the voltage to ground There should be less than 0 5V	Poor ground (G101) An open in the wire
5	LT BLU	K-LINE	Under all conditions	Measure the voltage to ground There should be 9-12 V	Bad control unit on the k-line K-line short to ground