B1601-LEFT SOLAR SENSOR CIRCUIT LOW (ATC)
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With ignition on.
- Set Condition:
If the Left Sunload Sensor input is out of range toward the low voltage threshold.
| Possible Causes |
| (G39) SUN SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND |
| (G39) SUN SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO (G939) SUN SENSOR RETURN CIRCUIT |
| SUN
SENSOR |
| A/C HEATER CONTROL |
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.
Diagnostic Test
1. CHECK FOR DTC B1601–LEFT SOLAR SENSOR CIRCUIT LOW WITH SUN SENSOR HARNESS CONNECTOR DISCONNECTED
Turn the ignition off.
Disconnect the Sun Sensor harness connector.
Turn the ignition on.
With the scan tool, erase HVAC DTCs.
Turn the ignition off, wait 10 seconds, and turn the ignition on.
With the scan tool, read HVAC DTCs.
Does the scan tool display: B1601–LEFT SOLAR SENSOR CIRCUIT LOW?
Yes
- Go To 2
No
- Replace the Sun Sensor in accordance with the Service Information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
2. CHECK (G39) SUN SENSOR NO. 1 SIGNAL CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance of the (G39) Sun Sensor No. 1 Signal circuit between ground and the A/C Heater Control C1 harness connector.
Is the resistance below 10k ohms?
Yes
- Repair the (G39) Sun Sensor No. 1 Signal circuit for a short to ground.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 3
3. CHECK (G39) SUN SENSOR NO. 1 SIGNAL CIRCUIT FOR A SHORT TO (G939) SUN SENSOR RETURN CIRCUIT
Measure the resistance between the (G39) Sun Sensor No. 1 Signal circuit and the (G939) Sun Sensor Return circuit in the A/C Heater Control C1 harness connector.
Is the resistance below 10k ohms?
Yes
- Repair the (G39) Sun Sensor No. 1 Signal circuit for a short to the (G939) Sun Sensor Return circuit.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Replace the A/C Heater Control in accordance with the Service Information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).