Immobilizer-Keyless Control Unit Input Test (2/4-door)

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. A18 (10 A) fuse in the under-hood fuse/relay box is OK.
• Before testing, make sure the No. B11 (5 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.

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.

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	RED	S-NET	Jump the SCS line with the HDS, disconnect PCM connector A (50P)	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 (50P) terminal No. 40: There should be continuity.	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.	Poor ground (G503) An open or high resistance in the ground wire

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. A18 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
6	PUR	IG1 MON	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. B11 (5 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
1	BRN	GND	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G503) 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