B1229

Control System DTCs

DTC Troubleshooting: B1229 - (07)

DTC B1229 or DTC indicator 07 : An Open in the Sunlight Sensor Circuit

1. Problem verification:

Problem verification
-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 with the HDS or the climate control unit How To Troubleshoot The Climate Control System.

-4. Check for DTCs.

Is DTC B1229 or 07 indicated?
-YES- Go to step 2.
-NO- Intermittent failure. Check for loose wires or poor connections on the sunlight sensor circuit.

2. Sunlight sensor check:

Sunlight sensor check
-1. Test the sunlight sensor Testing and Inspection.

Is the sunlight sensor OK?
-YES- Go to step 3.
-NO- Replace the sunlight sensor Service and Repair.

3. Open wire check (TSUN line):

Open wire check (TSUN line)
-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connectors.





-3. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- The TSUN wire is OK. Go to step 4.
-NO- Repair an open in the wire between the climate control unit and the sunlight sensor.

4. Open wire check (SENSOR_COM line):

Open wire check (SENSOR_COM line)
-1. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- The SENSOR_COM wire is OK. Replace the climate control unit . Service and Repair
-NO- Repair an open in the wire between the climate control unit and the sunlight sensor.