B1229

Control System DTCs

DTC Troubleshooting: B1229 - (07)

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


1. 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 Function 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:

-1. Turn the ignition switch to LOCK (0).

-2. Test the sunlight sensor Testing and Inspection.

Is the sunlight sensor OK?
-YES- With the automatic lighting/sunlight sensor disconnected, go to step 3.
-NO- Replace the sunlight sensor Service and Repair.

3. Open wire check (TSUN line):

-1. Disconnect the following connector.





-2. 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):

-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 Climate Control Unit Removal And Installation (Climate Control).
-NO- Repair an open in the wire between the climate control unit and the sunlight sensor.