DTC B1566 [BCM]

id0902f5838200

Description

Rear door switch (LH)/(RH) circuit malfunction
Detection condition
•  Short to ground in rear door switch (LH) or (RH) circuit with the rear doors closed (rear door switches off).
Possible cause
•  Rear door switch (LH) connector or terminal malfunction
•  Rear door switch (LH) malfunction
•  BCM connector or terminal malfunction
•  Short to ground in wiring harness between rear door switch (LH) terminal A and BCM terminal 6R
•  Rear door switch (RH) connector or terminal malfunction
•  Rear door switch (RH) malfunction
•  Short to ground in wiring harness between rear door switch (RH) terminal A and BCM terminal 6Q
•  BCM malfunction

Diagnostic procedure

Step

Inspection

Action
1
INSPECT REAR DOOR SWITCH (LH) CONNECTOR
•  Turn the ignition switch to the OFF position.
•  Disconnect the negative battery cable.
•  Disconnect the rear door switch (LH) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is there any malfunction?
Yes
Repair or replace the connector, then go to Step 8.
No
Go to the next step.
2
INSPECT REAR DOOR SWITCH (LH)
•  Inspect the rear door switch (LH).
•  Is there any malfunction?
Yes
Replace the rear door switch (LH), then go to Step 8.
(See DOOR SWITCH REMOVAL/INSTALLATION.)
No
Go to the next step.
3
INSPECT BCM CONNECTOR
•  Disconnect the BCM connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is there any malfunction?
Yes
Repair or replace the connector, then go to Step 8.
No
Go to the next step.
4
INSPECT FOR SHORT TO GROUND IN REAR DOOR SWITCH (LH) CIRCUIT
•  Verify that the rear door switch (LH) and BCM connectors are disconnected.
•  Inspect for continuity between rear door switch (LH) terminal A (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness which has a short to ground, then go to Step 8.
No
Go to the next step.
5
INSPECT REAR DOOR SWITCH (RH) CONNECTOR
•  Disconnect the rear door switch (RH) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is there any malfunction?
Yes
Repair or replace the connector, then go to Step 8.
No
Go to the next step.
6
INSPECT REAR DOOR SWITCH (RH)
•  Inspect the rear door switch (RH).
•  Is there any malfunction?
Yes
Replace the rear door switch (RH), then go to Step 8.
(See DOOR SWITCH REMOVAL/INSTALLATION.)
No
Go to the next step.
7
INSPECT FOR SHORT TO GROUND IN REAR DOOR SWITCH (RH) CIRCUIT
•  Verify that the rear door switch (LH), (RH) and BCM connectors are disconnected.
•  Inspect for continuity between rear door switch (RH) terminal A (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness which has a short to ground, then go to the next step.
No
Go to the next step.
8
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC for the BCM using the M-MDS.
•  Retrieve the BCM DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the BCM.
Go to the next step.
No
Go to the next step.
9
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [BCM].)
No
DTC troubleshooting completed.