B1229

DTC Troubleshooting: B1229, E and AUTO

DTC B1229 or DTC indicator E and AUTO:

An Open in the Sunlight Sensor Circuit

1. Clear the DTC with the HDS.

2. Turn the ignition switch to LOCK (0), and then back to ON (II).

3. Do the Self-Diagnostic Function with the HDS or the climate control unit.

4. Check for DTCs.

Is DTC B1229 or E and AUTO indicated?

YES -

Go to step 5.

NO -

Intermittent failure. Check for loose wires or poor connections on the sunlight sensor circuit.

5. Turn the ignition switch to LOCK (0).

6. Disconnect the sunlight sensor 5P connector (with automatic lighting) or 2P connector (without automatic lighting).

7. Disconnect climate control unit connectors A (28P) and B (12P).

8. Check for continuity between climate control unit connector A (28P) terminal No. 18 and sunlight sensor 5P connector terminal No. 2 (with automatic lighting), or sunlight sensor 2P connector terminal No. 2 (without automatic lighting).

With automatic lighting





Without automatic lighting





Is there continuity?

YES -

Go to step 9.

NO -

Repair an open in the wire between the climate control unit and the sunlight sensor.

9. Check for continuity between climate control unit connector B (12P) terminal No. 9 and sunlight sensor 5P connector terminal No. 4 (with automatic lighting), or sunlight sensor 2P connector terminal No. 1 (without automatic lighting).

With automatic lighting





Without automatic lighting





Is there continuity?

YES -

Go to step 10.

NO -

Repair an open in the wire between the climate control unit and the sunlight sensor.

10. Reconnect the sunlight sensor 5P connector (with automatic lighting) or 2P connector (without automatic lighting).

11. Reconnect climate control unit connectors A (28P) and B (12P).

12. Test the sunlight sensor Testing and Inspection.

Is the sunlight sensor OK?

YES -

Check for loose wires or poor connections at climate control unit connector A (28P), B (12P), and at the sunlight sensor 5P connector (with automatic lighting), or the sunlight sensor 2P connector (without automatic lighting). 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; with navigation Climate Control Unit Removal/Installation (With Navigation), without navigation Climate Control Unit Removal/Installation (Without Navigation).

NO -

Replace the sunlight sensor Service and Repair.