Galant L4-2.4L (4G69) (2004)
1. Disconnect A/C-ECU connector C-10 <manual air conditioning system (low)> or C-15 <manual air conditioning system (middle) or automatic air
conditioning system>.
2. Turn the ignition switch to the "ON" position.
3. Diagnose CAN bus lines, and check if the MUT-III screen is as shown in the illustration.
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Connect A/C-ECU connector C-10 <manual air conditioning system (low)> or C-15 <manual air conditioning system (middle) or automatic air
conditioning system>.
Q: Does the MUT-III screen correspond to the illustration?
YES: If the MUT-III screen corresponds to the illustration, go to Step 13 .
NO: If the MUT-III screen does not correspond to the illustration, go to Step 14.
STEP 13. Check the CAN bus lines between joint connector (3) and the A/C-ECU. Measure the resistance between joint connector (3) C-02 and
A/C-ECU connector C-10 <manual air conditioning system (low)> or C-15 <manual air conditioning system (middle) or automatic air
conditioning system>.
CAUTION: A digital multimeter should be used. For details Service Precautions/Vehicle Damage Warnings.
CAUTION: The test wiring harness should be used. For details Service Precautions/Vehicle Damage Warnings.