AMBIENT TEMPERATURE LOW (BCM)

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on.
Set Condition:
The Body Control Module (BCM) will set this DTC if voltage drops below 0.195 volts for more than 5 seconds on the (G31) Ambient Temperature Sensor Signal circuit.

Possible Causes

(G31) AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

(G31) AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (K300) SENSOR GROUND CIRCUIT

AMBIENT TEMPERATURE SENSOR

BCM

1.CHECK THE AMBIENT TEMPERATURE SENSOR VOLTAGE

Is the voltage below 0.5 volts?

Yes

2.CHECK THE AMBIENT TEMPERATURE SENSOR VOLTAGE WITH THE SENSOR DISCONNECTED

Is the voltage above 4.6 volts?

Yes

Replace the Ambient Temperature Sensor in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

3.CHECK THE (G31) AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Is the resistance below 10k ohms?

Yes

Repair the (G31) Ambient Temperature Sensor Signal circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

4.CHECK THE (G31) AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO THE (K300) SENSOR GROUND CIRCUIT

Is the resistance below 10k ohms?

Yes

Repair the (G31) Ambient Temperature Sensor Signal circuit for a short to the (K300) Sensor Ground circuit.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Replace and program the BCM in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

5.TEST FOR INTERMITTENT CONDITION

NOTE: The condition that set this DTC is not present at this time. The following may help in identifying the cause of the intermittent condition.

Were any problems found?

Yes