DTC 1-2-3 and 1-2-5

DTCs 1-2-3 AND 1-2-5. PASSENGER COMPARTMENT TEMPERATURE SENSOR GND SHORT:





DTC 1-2-3. Driver side passenger compartment temperature sensor GND short.
DTC 1-2-5. Passenger side passenger compartment temperature sensor GND short.

- Condition for DTC:
If signal from passenger compartment temperature sensor has a GND short, the control module records the fault and stores the DTC.

- Cause of fault:
Short in passenger compartment temperature sensor or wire.

- Symptoms:
Fault warning to driver. LEDs by A/C and REC buttons flash for 20 sec. The control module substitutes the faulty signal with an estimated value based on the desired temperature from both temperature sensors and the sensor signal from the working side. If the sensor signals are faulty on both the driver and passenger side, the control module uses the desired temperature from that side temperature switch only.

Connecting Test Unit To Control Module





- Ignition off.
- Connect test unit between control module and A/C system connector and check GND points. Connecting and Disconnecting Test Unit
- Go to the next step "Check Wire Resistance".

Check Wire Resistance:











- Ignition off.
- Disconnect adapter from control module.
- Disconnect connector from passenger compartment temperature sensor. Service and Repair
- Connect an ohmmeter.
On the drivers side, across # 10 and # 12.
On the passenger side, across # 10 and # 13.
If ohmmeter reads 0 ohm, short in wire between connector pin 5 and connector A to control module:
On driver side to pin A:12.
On passenger side to pin A:13.
Check wire for GND short. Checking Wires
Rectify GND short.
Check DTC. Test Procedures
If ohmmeter reading is infinite, wire is OK. Go to the next step "Check Passenger Compartment Temperature Sensor".

Check Passenger Compartment Temperature Sensor:








- Ignition off.
- Disconnect connector from passenger compartment temperature sensor. Service and Repair
- Connect an ohmmeter across pins 3 and 5 of the passenger compartment temperature sensor.
If value is OK, ohmmeter should read approx. 8 - 12 K ohms.
If not, ohmmeter reads 0 ohm, there is a short in the passenger compartment temperature sensor. Replace passenger compartment temperature sensor and refit in reverse order.
Check DTC. Test Procedures