Manufacturer Code Charts: 8

DTC Troubleshooting: B1232 or Indicator 8

DTC B1232 or DTC indicator 8: A Short in the Evaporator Temperature Sensor Circuit

1. Clear the DTC with the HDS.

2. Operate the heater-A/C control system in several modes.

3. Check for DTCs using the HDS or the self-diagnostic function.

Is DTC B1232 or 8 indicated?
YES - Go to step 4.

NO - Intermittent failure. Check for loose wires or poor connections on the evaporator temperature sensor circuit.


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

5. Remove the evaporator temperature sensor Service and Repair and test it. Evaporator Temperature Sensor Test

Is the evaporator temperature sensor OK?
YES - Go to step 6.

NO - Replace the evaporator temperature sensor.


6. Disconnect the HVAC control unit 30P connector.

7. Check for continuity between body ground and the HVAC control unit 30P connector terminal No. 24.

Is there continuity?
YES - Repair short to body ground in the wire between the HVAC control unit and the evaporator temperature sensor.

NO - Go to step 8.






8. Check for continuity between the HVAC control unit 30P connector terminals No. 20 and No. 24.

Is there continuity?
YES - Repair short in the wires between the HVAC control unit and the evaporator temperature sensor.

NO - Substitute a known-good HVAC control unit, HVAC Control Unit Removal/Installation (Without Climate Control) and recheck. If the symptom/indication goes away, replace the original HVAC control unit.