Hands Free Telephone Control Unit Input Test

1. Remove the upper panel.

1. Disconect the 22P connector (A) from the hands free telephone control unit (B).

1. 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 .

1. 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 .

   Cavity | Wire | Test condition | Test: Desired result | Possible cause if result is not obtained
   --- | --- | --- | --- | ---
   13 | BLK | Under all conditions | Check for voltage to ground: There should be less than 1 V. |
   - Poor ground (G506)
   - An open in the wire
   11 | WHT | Under all conditions | Check for voltage to ground: There should be battery voltage. |
   - Blown No. 5 (20 A) fuse in the driver's under-dash fuse/relay box
   - An open in the wire
   1 | YEL *1 RED *2 | Ignition switch ACC (I) or ON (II) | Check for voltage to ground: There should be battery voltage. |
   - Blown No. 32 (7.5 A) fuse in the driver's under-dash fuse/relay box
   - An open in the wire

1. 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 hands free telephone control unit must be faulty, replace it.

   Cavity | Wire | Test condition | Test: Desired result | Possible cause if result is not obtained
   --- | --- | --- | --- | ---
   14 | LT GRN | Under all conditions | Check for continuity between No. 14 terminal and the driver's under-dash fuse/relay box connector X (39P) terminal No. 22: 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