DTC 2-1-2, 2-2-2, 2-3-2, 2-3-4 and 2-3-6

DTC 2-1-2, 2-2-2, 2-3-2, 2-3-4 AND 2-3-6.
DAMPER MOTOR POSITION SENSOR GND SHORT:





DTC 2-1-2 = Driver side damper motor position sensor GND short.
DTC 2-2-2 = Passenger side damper motor position sensor GND short.
DTC 2-3-2 = Ventilation damper motor position sensor GND short.
DTC 2-3-4 = Floor/defrost damper motor position sensor GND short.
DTC 2-3-6 = Recirculation damper motor position sensor GND short.

- Condition for DTC:
If signal from damper motor position sensor is GND short (0 V), the control module records the fault and stores the DTC.

- Cause of fault:
Short or open circuit in wire. There may also be a short in the position sensor.

- Symptoms:
Fault warning to driver. LEDs by A/C and REC buttons flash for 20 sec. Control module ignores the faulty signal from the damper motor position sensor, and compensates as follows:
For DTC 2-1-2 and 2-2-2
Control module only changes the damper position if the temperature switch is moved. If the temperature switch is moved, the damper moves by a corresponding amount.

For DTC 2-3-2 and 2-3-4
The control module uses a substitute value corresponding to a 1OO % defrost setting on the air distribution switch.

For DTC 2-3-6
The control module uses a substitute value based on a setting of 0 % recirculation on the air distribution switch.

Check Other DTCs:





2-1-2, 2-2-2, 2-3-2, 2-3-4 and 2-3-6. Are these other DTCs stored as well?
- If YES, this means there is an open circuit in the live wire common to all damper motor potentiometers. Check wire across connector A pin A:8 to control module and branching point 23/307 for open circuit. Checking Wires
Rectify open circuit.
Check DTC. Test Procedures
- If NO, this means there is a GND short in a wire which only runs between the control module and the damper motor to which the DTC applies. Go to the next step "Connect Test Unit To Control Module".

Connect Test Unit To Control Module:








- Ignition off.
- Connect test unit between control module and A/C system connector, check GND points and check power supply to damper motor position sensor. 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 damper motor. Service and Repair
- Connect an ohmmeter to test unit # 10 and:
Driver side damper motor, to test unit # 17.
Passenger side damper motor, to test unit # 18.
Ventilation damper motor; to test unit # 20.
Floor/defrost damper motor; to test unit # 19.
Recirculation damper motor; to test unit # 21.
- If ohmmeter reads 0 ohm, short in wire between wire connector pin 3 and connector A to control module:
Driver side damper motor to pin A:17.
Passenger side damper motor to pin A:18.
Ventilation damper motor to pin A:20.
Floor/defrost damper motor to pin A:19.
Recirculation damper motor to pin A:21.
Check wire for GND short. Checking Wires
Rectify short.
Check DTC. Test Procedures
- If ohmmeter reading is infinite, wire is OK. Go to the step "Check Damper Motor Position Sensor"(below).

Check Damper Motor Position Sensor:








- Ignition off.
- Disconnect connector and damper motor.
- Connect an ohmmeter across pin 1 and 3 on damper motor. Turn damper motor output shaft. Ohmmeter should fluctuate between approx. 0-12 K ohms.
- If value is OK, check live wire between wire connector pin 2 and connector A pin A:8 to control module for open circuit.
- If value is not OK, if ohmmeter reading is constant at 0 ohm, there is a short in the damper motor position sensor. Replace damper motor and refit in reverse order.
Check DTC. Test Procedures