E and AUTO

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 by turning the ignition switch to LOCK (0), and then turn to ON (II).

2. Operate the climate control system in several modes.

3. Check for DTCs using the HDS How to Troubleshoot the Climate Control System or self-diagnostic function How to Troubleshoot the Climate Control System.

Is DTC B1229 or E and AUTO 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 to LOCK (0).

5. Test the sunlight sensor Sunlight Sensor Test.

Is the sunlight sensor OK?

YES -

Go to step 6.

NO -

Replace the sunlight sensor Service and Repair.�

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

7. Disconnect the front climate control unit 30P connector.

8. Check for continuity between front climate control unit 30P connector terminal No. 20 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 9.

NO -

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

9. Check for continuity between front climate control unit 30P connector terminal No. 29 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 -

Check for loose wires or poor connections at the front climate control unit 30P connector 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 front climate control unit, and recheck. If the symptom/indication goes away, replace the original front climate control unit Front Climate Control Unit Removal/Installation.�

NO -

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