| 1. | Check the No.30 (7.5A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES - Go to 2. NO - Replace the fuse, and recheck.n |
| 2. | Disconnect the audio-HVAC module 22P connector. |
| 3. | Turn the ignition switch ON (II). |
| 4. | Measure the voltage between the No. 20 terminal of the audio-HVAC module 22P connector and body ground. Is there battery voltage? YES - Go to 5. NO - Repair open in the wire between the No. 30 fuse in the under-dash fuse/relay box and the audio-HVAC module.n |
| 5. | Turn the ignition switch OFF. |
| 6. | Check for continuity between the No. 22 terminal of the audio-HVAC module 22P connector and body ground. Is there continuity? YES - Check for loose wires or poor connections at the audio-HVAC module 22P connector. If the connections are good, substitute a known-good audio-HVAC module, and recheck. If the symptom/indication goes away, replace the original printed circuit board.n NO - Check for an open in the wire between the audio-HVAC module and body ground. If the wire is OK, check for poor ground at G503.n |