Diagnostic procedure

DIAGNOSTIC PROCEDURE DESCRIPTION

Step	INSPECTION		ACTION
1	INSPECT IG1 RELAY FOR MALFUNCTION Switch the ignition off. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Remove the IG1 relay. (See RELAY LOCATION .) Inspect the IG1 relay. (See RELAY INSPECTION .) Is the IG1 relay normal?	Yes	Go to the next step.
1		No	Replace the IG1 relay, then go to Step 9. (See RELAY LOCATION .)
2	PERFORM FRONT BODY CONTROL MODULE (FBCM) DTC INSPECTION Perform the front body control module (FBCM) DTC inspection using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)] .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)] .)
2		No	Go to the next step.
3	VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION Switch the ignition off. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Disconnect the climate control unit connector. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER] .) Inspect the connector and terminals (corrosion, damage, pin disconnection). Are the connector and terminals normal?	Yes	Go to the next step.
3		No	Repair/replace the connector or terminal. After repair procedure, go to Step 9.
4	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY VOLTAGE (IG1) Climate control unit connector is disconnected. Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Switch the ignition ON (engine off or on). Measure the voltage at the following terminals (wiring harness-side): Climate control unit terminal 1W Is the voltage B+?	Yes	Go to the next step.
4		No	Inspect the C/U IG1 15 A fuse. If the fuse is blown: Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and C/U IG1 15 A fuse. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. Replace the fuse. If the fuse is damaged: Replace the fuse. If the fuse is normal: Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and MAIN 200 A fuse. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit. Then go to Step 9.
5	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY VOLTAGE (IG2) Climate control unit connector is disconnected. Measure the voltage at the following terminals (wiring harness-side): Climate control unit terminal 1N Is the voltage B+?	Yes	Go to Step 9.
5		No	Go to the next step.
6	VERIFY FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION Switch the ignition off. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Disconnect the front body control module (FBCM) connector. (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION .) Inspect the connector and terminals (corrosion, damage, pin disconnection). Are the connector and terminals normal?	Yes	Go to the next step.
6		No	Repair/replace the connector or terminal. After repair procedure, go to Step 9.
7	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT (IG2) FOR OPEN CIRCUIT Climate control unit and front body control module (FBCM) connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): Climate control unit terminal 1N-front body control module (FBCM) terminal 1C Is there continuity?	Yes	Go to the next step.
7		No	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and front body control module (FBCM) terminal. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit. Go to Step 9.
8	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT (IG2) FOR SHORT TO GROUND Climate control unit and front body control module (FBCM) connectors are disconnected. Inspect for continuity between the following terminal (wiring harness-side) and body ground: Climate control unit terminal 1N Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and front body control module (FBCM) terminal. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. Go to the next step.
8		No	Go to the next step.
9	VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN Switch the ignition off. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Reconnect the disconnected connectors. Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Clear the DTC from the climate control unit memory using the M-MDS. (See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)] .) Perform the DTC inspection for the climate control unit using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)] .) Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER] .) Go to the next step.
9		No	Go to the next step.
10	VERIFY THAT NO OTHER DTCs ARE PRESENT Verify other DTCs displayed. Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)] .)
10		No	DTC troubleshooting completed.