DTC U0140 [AUTO LIGHT/WIPER CONTROL MODULE]

id0902j1990000

Description

Communication error with BCM
Detection condition
•  Auto light/wiper control module cannot receive the signal from the BCM for 5 s or more.
Possible cause
•  Auto light/wiper control module connector or terminal malfunction
•  BCM connector or terminal malfunction
•  Short to ground in wiring harness between BCM terminal 3B and auto light/wiper control module terminal 2P
•  Open circuit in wiring harness between BCM terminal 3B and auto light/wiper control module terminal 2P
•  BCM malfunction
•  Auto light/wiper control module malfunction

Diagnostic procedure

Step

Inspection

Action
1
INSPECT AUTO LIGHT/WIPER CONTROL MODULE CONNECTOR
•  Turn the ignition switch to the OFF position.
•  Disconnect the negative battery cable.
•  Disconnect the auto light/wiper control module 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 6.
No
Go to the next step.
2
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 6.
No
Go to the next step.
3
INSPECT FOR SHORT TO GROUND IN WIRING HARNESS BETWEEN BCM AND AUTO LIGHT/WIPER CONTROL MODULE
•  Verify that the auto light/wiper control module and BCM connectors are disconnected.
•  Inspect for continuity between auto light/wiper control module terminal 2P (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 6.
No
Go to the next step.
4
INSPECT FOR OPEN CIRCUIT IN WIRING HARNESS BETWEEN BCM AND AUTO LIGHT/WIPER CONTROL MODULE
•  Verify that the auto light/wiper control module and BCM connectors are disconnected.
•  Inspect for continuity between BCM terminal 3B (wiring harness-side) and auto light/wiper control module terminal 2P (wiring harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness which has an open circuit, then go to Step 6.
5
PERFORM DTC INSPECTION AND VERIFY BCM MALFUNCTION
•  Make sure to reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC for the auto light/wiper control module using the M-MDS.
•  Turn the ignition switch to the ON position and wait for 5 s or more.
•  Retrieve the auto light/wiper control module DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Replace the BCM, then go to the next step.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
No
Go to Step 7.
6
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC for the auto light/wiper control module using the M-MDS.
•  Turn the ignition switch to the ON position and wait for 5 s or more.
•  Retrieve the auto light/wiper control module DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the auto light/wiper control module.
Go to the next step.
No
Go to the next step.
7
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 [AUTO LIGHT/WIPER CONTROL MODULE].)
No
DTC troubleshooting completed.