| 1. | Check for body DTCs in test mode A of the MICS. Are the any DTCs indicated? YES - Do the appropriate troubleshooting for the DTC indicated.n NO - Go to 2. |
| 2. | Disconnect the A/C pressure switch 2P connector. |
| 3. | Turn the ignition switch ON (II). |
| 4. | Measure the voltage between the No. 1 terminal of the A/C pressure switch 2P connector and body ground. Is there 5 V or more? YES - Go to 5. NO - Go to 14. |
| 5. | Turn the ignition switch OFF. |
| 6. | Check for continuity between the No. 1 and No. 2 terminals of the A/C pressure switch. Is there continuity? YES - Go to 7. NO - Go to 15. |
| 7. | Reconnect the A/C pressure switch 2P connector. |
| 8. | Disconnect the climate control unit connector A ( 22P). |
| 9. | Turn the ignition switch ON (II). |
| 10. | Measure the voltage between the No. 5 terminal of the climate control unit connector A (22P) and body ground. Is there 5 V or more? YES - Go to 11. NO - Repair open in the wire between the climate control unit and the A/C pressure switch.n |
| 11. | Turn the ignition switch off. |
| 12. | Measure the resistance between the No. 14 and No. 15 terminals of the climate control unit connector A (22P). Is the resistance less than 24k ohms? YES - Go to 13. NO - Repair cause of high resistance in the evaporator temperature circuit.n |
| 13. | Perform the A/C communication in the Self-Diagnostic Function to obtain the IS-BUS communication verification status. Is the communication OK? YES - Check for loose wire or poor connections at climate control unit connector A (22P) and at the A/C pressure switch 2P connector. If the connections are good, substitute a known-good climate control unit and printed circuit board, and recheck. If the symptom/indication goes away, replace the original climate control unit and printed circuit board.n NO - Check for loose wire or poor connections at climate control unit connector A (22P) and at the A/C pressure switch 2P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.n |
| 14. | Measure the voltage between the No. 2 terminal of under-hood fuse/relay box connector H (14P) and body ground with the under-hood fuse/relay box connectors connected. Is there 5 V or more? YES - Repair open in the wire between the under-hood fuse/relay box and the A/C pressure switch.n NO - Check for loose or poor connections at the No. 2 terminal of the under-hood fuse/relay box. if the connections are OK, replace the under-hood fuse/relay box.n |
| 15. | Check for proper A/C system pressure. Is the pressure within specifications? YES - Replace the A/C pressure switch.n NO - Repair the A/C pressure problem.n |