- No control module fault stored.
- No fault on the supply voltage (5 Volts).
Short to B+ / Short to Ground
1. Remove sun sensor.
2. Disconnect plug connection on the sun sensor.
3. Connect voltmeter to sleeve side of pin 2 (minus) and pin 3 (plus).
Switch on ignition.
Display: approx. 4.5 - 5 Volts
If 0 Volts is displayed, check wiring to the heating/air conditioning control A-12 and B-18 for continuity.
Check wiring to the heating/air conditioning control B-18 for short to ground.
Note:
The wires are routed via two plug connections on the heater/ A/C unit. Replace the heating/air conditioning control if the wires are OK.
4. Connect ohmmeter to sun sensor pins 2 and 3.
- Sun sensor not in darkness
Display: approx. 1.3 megohms
- Sun sensor in darkness
Display: approx. 240 kohms
Fault Code 21
Fault Code 21
Outside Temperature Sensor - B+/Ground Short
Diagnostic conditions
- Ignition on
- No control unit fault stored
- No sensor supply voltage fault stored (5 V)
Possible cause of fault
- Short circuit to B+/ground/between wires or open circuit in wiring between air-conditioning system regulator and outside temperature sensor
- Outside temperature sensor faulty
- Air-conditioning system regulator faulty
Affected pins
Plug B, pin 5 and pin 9
Diagnosis/troubleshooting