Diagnostic Procedure

STEP	INSPECTION		ACTION
1	VERIFY BCM DTCs Clear the DTC using the M-MDS. (See CLEARING DTC [BCM] .) Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM] .) Is the same DTC present?	Yes	Go to the next step.
1		No	Go to Step 9.
2	INSPECT AMBIENT TEMPERATURE SENSOR CONNECTOR AND TERMINALS Switch the ignition to off. Disconnect the negative battery cable. Disconnect the ambient temperature sensor connector. Inspect the connector and terminals (corrosion, damage, pin disconnection). Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 8.
2		No	Go to the next step.
3	INSPECT AMBIENT TEMPERATURE SENSOR Inspect the ambient temperature sensor. (See AMBIENT TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER] .) Is there any malfunction?	Yes	Replace the ambient temperature sensor, then go to Step 8. (See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER] .)
3		No	Go to the next step.
4	INSPECT BCM CONNECTOR AND TERMINALS Disconnect the BCM connector. Inspect the connector and terminals (corrosion, damage, pin disconnection). Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 8.
4		No	Go to the next step.
5	INSPECT AMBIENT TEMPERATURE SENSOR CIRCUIT FOR SHORT TO GROUND Verify that the ambient temperature sensor and BCM connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side) and body ground: Ambient temperature sensor terminal A Ambient temperature sensor terminal B Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to ground, then go to Step 8.
5		No	Go to the next step.
6	INSPECT AMBIENT TEMPERATURE SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY Verify that the ambient temperature sensor and BCM connectors are disconnected. Reconnect the negative battery cable. Switch the ignition to ON. Measure the voltage at the following terminals (wiring harness-side): Ambient temperature sensor terminal A Ambient temperature sensor terminal B Is there any voltage?	Yes	Repair or replace the wiring harness for a possible short to power supply, then go to Step 8.
6		No	Go to the next step.
7	INSPECT AMBIENT TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT Verify that the ambient temperature sensor and BCM connectors are disconnected. Switch the ignition to off. Disconnect the negative battery cable. Inspect for continuity between the following terminals (wiring harness-side): Ambient temperature sensor terminal A-BCM terminal 1X Ambient temperature sensor terminal B-BCM terminal 1H Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness for a possible open circuit, then go to the next step.
8	VERIFY TROUBLESHOOTING COMPLETED Make sure to reconnect all disconnected connectors. Reconnect the negative battery cable. Clear the DTC using the M-MDS. (See CLEARING DTC [BCM] .) Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM] .) Is the same DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION .) Go to the next step.
8		No	Go to the next step.
9	VERIFY THAT NO OTHER DTCs ARE PRESENT Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [BCM] .)
9		No	DTC troubleshooting completed.