Immobilizer-Keyless Control Unit Input Test

NOTE: SRS components are located in this area. Review the SRS component locations - Refer to: SRS Component Location Index ('12: Natural Gas models) , SRS Component Location Index ('12: except Natural Gas models) , SRS Component Location Index ('13-'15) , and precautions and procedures - Refer to: SRS Precautions and Procedures ('12) , SRS Precautions and Procedures ('13-'15) before doing repairs or servicing.

1. Turn the ignition switch to LOCK (0)

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.

1. Cavity	Wire	Terminal name	Test condition	Test: Desired result	Possible cause if desired result is not obtained
   2	LT GRN	S-NET	Jump the SCS line with the HDS, disconnect ECM/PCM connector A (49P) - Refer to: How to Troubleshoot the Fuel and Emissions Systems (K24Z7) , How to Troubleshoot the Fuel and Emissions Systems (R18Z1) , How to Troubleshoot the A/T System (A/T) , How to Troubleshoot the Fuel and Emissions Systems (R18A9) , How to Troubleshoot the CVT System (CVT) ('14-'15)	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 ECM/PCM connector A (49P) terminal No. 17: There should be continuity.	An open or high resistance 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 under-dash fuse/relay box Poor ground (G101) 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 - Refer to: Immobilizer-Keyless Control Unit Removal and Installation , Immobilizer-Keyless Control Unit Registration .

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

• Cavity	Wire	Terminal name	Test condition	Test: Desired result	Possible cause if desired result is not obtained
  7	WHT	+B_BACK_UP	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. A29 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
  6	YEL	IG1_FUEL_PUMP	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. B4 (15 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
  1	BLK	LG	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G101) 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