Diagnosis Procedure
Regarding Wiring Diagram information, refer to DEF-12, "Wiring Diagram".
1. CHECK DOOR MIRROR DEFOGGER FUSE
Check if the following fuse in fuse block (J/B) is blown.

Is the inspection result normal? YES >> GO TO 2.
NO >> Replace the blown fuse after repairing the affected circuit.
2. CHECK DOOR MIRROR DEFOGGER POWER SUPPLY CIRCUIT

Is the inspection result normal? YES >> GO TO 3.
NO >> Replace fuse block (J/B).
3. CHECK BOTH DOOR MIRROR DEFOGGER
Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-41, "Intermittent Incident".
NO >> Repair or replace the malfunctioning parts.
Rear window defogger does not operate but both of door mirror defogger
operate
Driver side door mirror defogger does not operateU1040 ENG comm circuit
DTC Description
DTC DETECTION LOGIC
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
U1040
ENG COMM CIRCUIT
(Engine communication circuit)
ECM cannot transmit a communication signal to generator.
POSSIBLE CAUSE
Harne ...
Glass lid
Exploded View
Panoramic roof glass
Glass lid
Side trim covers (LH/RH)
Front drain hose (LH/RH)
Moonroof motor assembly
Sunshade motor assembly
Moonroof front bracket (LH/RH)
Moonroof rear bracket (LH/RH)
Rear drain hose (LH/RH)
Moonroof unit assembly ...
Wiring diagram
BCM
Wiring Diagram
...