Control Unit Input Test
- Remove the throttle actuator control module, adaptive cruise control (ACC) unit (see DISTANCE SWITCH TEST ) and the HandsFreeLink control unit (see HANDSFREELINK CONTROL UNIT REMOVAL/INSTALLATION ).
- Disconnect the 28P connector (A) from the HandsFreeLink control unit (B).
- 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 4.
- Reconnect the connector, and 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, go to step 5.
TEST RESULT REFERENCECavity Wire Test condition Test: Desired result Possible cause if result is not obtained 1 BLK Under all conditions Measure the voltage to ground:
There should be less than 0.1 V.- Poor ground (G651)
- An open in the wire
15 WHT Under all conditions Measure the voltage to ground:
There should be battery voltage.- Blown No. 5 (7.5 A) fuse in the driver's under-dash fuse/relay box
- An open in the wire
16 PUR Ignition switch ACC (1) or ON (II) 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
- Disconnect the 22P connector again, and make this input test at the connector.
- If the test indicates a problem, find and correct the cause, then recheck the system.
- If the input test proves OK, the HandsFreeLink control unit must be faulty, replace it.
TEST RESULT REFERENCECavity Wire Test condition Test: Desired result Possible cause if result is not obtained 18 LT GRN Under all conditions Check for continuity between terminal No. 18 and the driver's under-dash fuse/relay box connector X (39P) terminal No. 27:
There should be continuity.An open in the wire Driver's under-dash fuse/relay box connector X (39P) disconnected Check for continuity to ground:
There should be no continuity.Short to ground