Control Unit Input Test
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
).
- Disconnect the 28P connector (A) from the HandsFreeLink control unit (B). (see The HFL system is locked and the pass code has been lost or forgotten ).
- Inspect the connector and socket terminals for a good pinfit 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 3.
- 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.
TERMINALS REFERENCECavity 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 (G504)
- An open in the wire
15 WHT/RED Under all conditions Measure the voltage to ground: There should be battery voltage. - Blown No. 7 (7.5 A) fuse in the driver's under-dash fuse/relay box
- An open in the wire
16 YEL/RED Ignition switch ON (ID Measure the voltage to ground: There should be battery voltage. - Blown No. 32 (10 A) fuse in the driver's under-dash fuse/ relay box
- An open in the wire
18 WHT Under all conditions Check for continuity between No. 18 terminal and the driver's under-dash fuse/relay box connector N (45P) terminal No. 22:
There should be continuity.An open in the wire Driver's under-dash fuse/relay box connector N (45P) and climate control unit 30P connector terminal No. 7 disconnected Check for continuity to ground: There should be no continuity. A short to ground in the wire