Control Unit Input Test/Replacement
NOTE:
Before testing, troubleshoot the multiplex integrated control system using B-CAN System Diagnosis Test Mode A (see
TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A
).
- Remove the roof console (see step 2 on HEADLINER REMOVAL/INSTALLATION ) .
- Disconnect the 28P connector (A) from the HandsFreeLink control unit (B).
- Inspect the connector and socket terminals for a good pin fit 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, make these input tests at the connector.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, the HandsFreeLink control unit must be faulty; replace it.
TEST CONDITIONCavity Wire Test condition Test: Desired result Possible cause if result is not obtained 1 BLK Under all conditions Check for continuity to ground:
There should be continuity.- Poor ground (G503, G601)
- An open in the wire
15 GRY/BLU Under all conditions Measure the voltage to ground:
There should be battery voltage.- Blown No. 6 (7.5 A) fuse in the under-dash fuse/relay box
- An open in the wire
19 WHT Under all conditions Check for continuity between No. 19 terminal and the under-dash fuse/relay box connector X (39P) terminal No. 18:
There should be continuity.An open in the wire Under dash fuse relay box connector X (39P) disconnected Check for continuity to ground:
There should be no continuity.A short to ground in the wire 16 YEL/RED Ignition switch ON (II) Measure the voltage to ground:
There should be battery voltage.- Blown No. 32 (7.5 A) fuse in the under-dash fuse/relay box
- An open in the wire