B1229
DTC B1229 or DTC indicator E: An Open in the Sunlight Sensor Circuit1. Clear the DTC with the HDS.
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic.
Is DTC B1229 or E indicated?
YES - Go to step 4.
NO - Intermittent failure, check for loose wires or poor connections on the sunlight sensor circuit.
4. Turn the ignition switch OFF.
5. Disconnect the sunlight sensor 2P connector.
6. Disconnect the climate control unit 30P connector.
7. Check for continuity between the climate control unit 40P connector No. 10 terminal and the sunlight sensor 2P connector No. 1 terminal.
Is there continuity?
YES - Go to step 8.
NO - Repair open in the wire between the climate control unit and the sunlight sensor.
8. Check for continuity between the climate control unit 30P connector No. 22 terminal and the sunlight sensor 2P connector No. 2 terminal.
Is there continuity?
YES - Go to step 9.
NO - Repair open in the wire between the climate control unit and the sunlight sensor.
9. Reconnect the sunlight sensor 2P connector.
10. Reconnect the climate control unit 30P connector.
11. Test the sunlight sensor.
Is the sunlight sensor OK?
YES - Check for loose wires or poor connections at the climate control unit 30P connector and at the sunlight sensor 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.
NO - Replace the sunlight sensor.