Immobilizer-Keyless Control Unit Input Test
NOTE:
- SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX ), and precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before doing repairs or servicing.
- Before testing the immobilizer-keyless control unit, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ) and check the No. 19 (20 A) and No. 7 (10 A) fuses in the under-dash fuse/relay box.
- Remove the steering column covers (see COLUMN COVER 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 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 Test condition Test: Desired result Possible cause if desired result is not obtained 3 LT GRN (S-NET) Disconnect PCM connector A (49P) and under-dash fuse/relay box connector Q (14P). Check for continuity between terminal No. 3 and PCM connector A (49P) terminal No. 46:
There should be continuity.An open or high resistance in the wire Check for continuity between terminal No. 3 and under-dash fuse/relay box connector Q (14P) terminal No. 9:
There should be continuity.Check for continuity to body ground:
There should be no continuity.A short to ground in the wire 4 LT GRN (B-CAN) Disconnect under-dash fuse/relay box connector N (45P). Check for continuity between terminal No. 4 and under-dash fuse/relay box connector N (45P) terminal No. 28:
There should be continuity.An open or high resistance in the wire Check for continuity to body ground:
There should be no continuity.A short to ground in the wire 5 ORN (K-LINE) Under all conditions Check for continuity between terminal No. 5 and data link connector (16P) terminal No. 7:
There should be continuity.An open or high resistance in the wire Check for continuity to body ground:
There should be no continuity.A short to ground in the wire - Reconnect the connector to the immobilizer-keyless control unit, and 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, the immobilizer-keyless control unit must be faulty; replace it.
Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 1 WHT (VBU) Under all conditions Measure the voltage to body ground:
There should be battery voltage.- Faulty under-dash fuse/relay box
- Blown No. 4 fuse in the main under-hood fuse box
- Faulty main under-hood fuse box
- An open or high resistance in the wire
2 BRN (IG1) Ignition switch ON (II) Measure the voltage to ground:
There should be battery voltage.- Faulty under-dash fuse/relay box
- An open or high resistance in the wire
7 BRN (LG3) In all ignition switch positions Measure the voltage to ground:
There should be less than 0.2 V.- Poor ground (G101) or an open in the ground wire
- An open or high resistance in the wire
- Faulty PCM
6 PNK (IG KEY SW) Ignition key inserted into the ignition switch Measure the voltage to ground:
There should be less than 0.2 V.- Poor ground (G601) or an open in the ground wire
- Faulty under-dash fuse/relay box
- Faulty ignition key switch
- An open or high resistance in the wire