Immobilizer-Keyless Control Unit Input Test
WARNING: This page is about a different car, the 2013 Honda Fit, 2012 Honda Fit, 2011 Honda Fit, 2010 Honda Fit, and 2009 Honda Fit. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX ), and precautions and procedures before doing repairs or servicing (see PRECAUTIONS AND PROCEDURES ).
- 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 SIDE DEFOGGER VENT TRIM REMOVAL/INSTALLATION ).
- Disconnect the 7P connector (A) from the immobilizer-keyless control unit (B).
- 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 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 5.
IMMOBILIZER-KEYLESS CONTROL UNIT INPUT TEST REFERENCE TABLECavity Wire Terminal name Test condition Test: Desired result Possible cause if desired result is not obtained 4 LT GRN B-CAN Disconnect the gauge control module 32P connector Check for continuity between the terminal No. 4 and the gauge control module 32P connector terminal No. 18:
There should be continuity.An open in the wire Disconnect driver's under-dash fuse/relay box connector 0. (16P) Check for continuity between the terminal No. 4 and driver's under-dash fuse/relay box connector Q (16P) terminal No. 3:
There should be continuity.An open in the wire 3 GRN IMOCD (S-NET) Disconnect ECM/PCM connector A (49P) (see HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM CONNECTORS ) 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 No. 3 and body ground:
There should be more than 50 k Ω.- Faulty imoes unit
- Faulty under-dash fuse/relay box
- An open in the wire
Disconnect ECM/PCM connector A (49P) (see HOW TO TROUBLESHOOT CIRCUITS AT THE ECM/PCM CONNECTORS ) Check for continuity between the terminal No. 3 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 IMMOBILIZER KEY REGISTRATION .IMMOBILIZER-KEYLESS CONTROL UNIT INPUT TEST REFERENCE TABLECavity Wire Terminal name Test condition Test: Desired result Possible cause if desired result is not obtained 1 PNK VBU Under all conditions Measure the voltage to ground:
There should be battery voltage.- Blown No. 1 (10 A) fuse in the under-dash fuse/relay box
- An open in the wire
2 RED IG1 Ignition switch ON (II) Measure the voltage to ground:
There should be battery voltage.- Blown No. 20 (15 A) fuse in the 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 0.2 V.- Poor ground (G101)
- An open in the wire
5 BLU K-LINE Under all conditions Measure the voltage to ground:
There should be pulse voltage (digital signal).- Bad control unit on the k-line
- K-line short to around