Immobilizer-Keyless Control Unit Input Test

NOTE: 

• SRS components are located in this area. Review the SRS component locations , and precautions and procedures before performing repairs or servicing.
• Before testing, make sure the No. B21 (10 A) fuse in the under-hood fuse/relay box is OK.
• Before testing, make sure the No. C32 (15 A) fuse in the under-dash fuse/relay box is OK.

1. Turn the vehicle to the OFF (LOCK) mode.

2. Disconnect the immobilizer-keyless control unit 7P connector.

Courtesy of HONDA, U.S.A., INC.

3. 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 are OK, go to step 4.

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
2	BLU	S-NET	Jump the SCS line with the HDS, disconnect PCM connector A (51P)	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
				Check for continuity between the terminal and PCM connector A (51P) terminal No. 17: There should be continuity.	Faulty under-dash fuse/relay box An open or high resistance in the wire
			Disconnect the 12 volt battery negative terminal	Measure the resistance between the terminal and body ground: There should be more than 50 kΩ.	Faulty under-dash fuse/relay box Poor ground (G401) An open or high resistance in the ground wire

5. Reconnect the connector to the immobilizer-keyless control unit, 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 .

NOTE:  After replacing the immobilizer-keyless control unit, and do the immobilizer key registration .

Cavity	Wire	Terminal name	Test condition	Test: Desired result	Possible cause if desired result is not obtained
7	RED	+B BACK UP	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. B21 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
6	WHT	IG1 FUEL PUMP	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. C32 (15 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
1	BLK	GND	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G401) An open or high resistance in the ground wire
3	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