Diagnosis Procedure
1.CHECK CONNECTOR
Turn the ignition switch OFF.
Disconnect the battery cable from the negative terminal.
Check the terminals and connectors of the BCM for damage, bend and loose connection (unit side and connector side).
2.CHECK HARNESS FOR OPEN CIRCUIT
Disconnect the connector of BCM.
Check the resistance between the BCM harness connector terminals.

3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the BCM. Refer to BCS-36, "Diagnosis Procedure".
ADP branch line circuit
DLC branch line circuitTrunk open function symptoms
TRUNK LID OPENER SWITCH
TRUNK LID OPENER SWITCH : Symptom Table
TRUNK OPEN FUNCTION MALFUNCTION
NOTE:
Before performing the diagnosis in the following table, check
"WORK FLOW". Refer to DLK-9, "Work Flow".
Check that vehicle is under the condition shown in "Conditions
of ve ...
U1300 AV comm circuit
Description
U1300 is indicated when a communication signal malfunction occurs. U1300 is
indicated along with DTCs that
identify components connected to the AV control unit through communication
lines. Determine the possible
malfunction cause from the table below.
SELF-DIAGNOSIS RESULTS DIS ...
Illumination control system
System Diagram
System Description
The illumination lamps operation is dependent upon the position of the
lighting switch (combination switch).
When the lighting switch is placed in
the 1ST or 2ND position (or if the auto light system is activated) the BCM
(body control module) receives in ...