B1602

B1602-LEFT SOLAR SENSOR CIRCUIT HIGH (ATC)

For a complete wiring diagram REFER to DIAGRAMS/ELECTRICAL .


- When Monitored:
With the ignition on.

- Set Condition:
If the Left Sunload Sensor input is out of range toward the high voltage threshold.







NOTE: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC is stored. Refer to HVAC System Test (ATC) for stored DTC test procedures. Heating-A/C System Diagnostics


Diagnostic Test


1. CHECK (G39) SUN SENSOR NO. 1 SIGNAL CIRCUIT VOLTAGE
Turn the ignition off.
Disconnect the Sun Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (G39) Sun Sensor No. 1 Signal circuit.
What voltage is present?

Above 5.2 Volts


- Go To 2


4.8 Volts to 5.2 Volts


- Go To 3


Below 4.8 Volts


- Go To 5


2. CHECK (G39) SUN SENSOR NO. 1 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
Turn the ignition on.
Measure the voltage of the (G39) Sun Sensor No. 1 Signal circuit in the Sun Sensor harness connector.
Is the voltage above 0.2 volts?

Yes


- Repair the (G39) Sun Sensor No. 1 Signal circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


No


- Replace the A/C Heater Control.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


3. CHECK THE SUN SENSOR AND (C121) SENSOR GROUND CIRCUIT FUNCTION
Turn the ignition off.
Connect a jumper wire between the (G39) Sun Sensor No. 1 Signal circuit and the (C121) Sensor Ground circuit in the Sun Sensor harness connector.
Turn the ignition on.
With the scan tool in HVAC, select Data Display and read the Left Solar Sensor voltage.
Is the voltage below 0.2 volts?

Yes


- Replace the Sun Sensor.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


No


- Go To 4


4. CHECK (C121) SENSOR GROUND CIRCUIT FOR AN OPEN
Turn the ignition off.
Disconnect the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
Measure the resistance of the (C121) Sensor Ground circuit between the Sun Sensor harness connector and the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
Is the resistance below 5.0 ohms?

Yes


- Replace the A/C Heater Control.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


No


- Repair the (C121) Sensor Ground circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


5. CHECK (G39) SUN SENSOR NO. 1 SIGNAL CIRCUIT FOR AN OPEN
Turn the ignition off.
Disconnect the A/C Heater Control 32 way harness connector.
Measure the resistance of the (G39) Sun Sensor No. 1 Signal circuit between the Sun Sensor harness connector and the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
Is the resistance below 5.0 ohms?

Yes


- Replace the A/C Heater Control.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


No


- Repair the (G39) Sun Sensor No. 1 Signal circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.