STEP 1. Using scan tool (M.U.T.-IIISE), check other system's DTC.
STEP 2. Measure the voltage at the A/C controller assembly (A/C-ECU) connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Ignition switch: "ON"
(3) Voltage between IG1 terminal and body groundOK: The voltage should measure approximately 12 volts (battery positive voltage)
Is the check result normal?
Go to Step 4. Go to Step 3.
STEP 3. Check of open circuit in IG1 line between ETACS-ECU connector and A/C controller assembly (A/C-ECU) connector.
STEP 4. Measure the voltage at the A/C controller assembly (A/C-ECU) connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Voltage between B/UP terminal and body groundOK: The voltage should measure approximately 12 volts (battery positive voltage)
Is the check result normal?
Go to Step 6. Go to Step 5.
STEP 5. Check of open circuit in B/UP line between ETACS-ECU connector and A/C controller assembly (A/C-ECU) connector.
STEP 6. Measure the resistance at the A/C controller assembly (A/C-ECU) connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Resistance between E terminal and body groundOK: Continuity exists (2 Ω or less)
Is the check result normal?
Replace the A/C controller assembly (A/C-ECU). Go to Step 7.
STEP 7. Check of open circuit in E line between A/C controller assembly (A/C-ECU) connector and body ground.