DTC U0140 [AUTO LIGHT/WIPER CONTROL MODULE]

id0902j1990000

Description | Communication error with BCM
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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
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1 | INSPECT AUTO LIGHT/WIPER CONTROL MODULE CONNECTOR • Turn the ignition switch to the OFF position. • Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • 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. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Clear the DTC for the auto light/wiper control module using the M-MDS. (See CLEARING DTC [AUTO LIGHT/WIPER CONTROL MODULE].) • 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. (See DTC INSPECTION [AUTO LIGHT/WIPER CONTROL MODULE].) • 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. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Clear the DTC for the auto light/wiper control module using the M-MDS. (See CLEARING DTC [AUTO LIGHT/WIPER CONTROL MODULE].) • 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. (See DTC INSPECTION [AUTO LIGHT/WIPER CONTROL MODULE].) • Is the same DTC displayed? | Yes | Repeat the inspection from Step 1. • If the malfunction recurs, replace the auto light/wiper control module. (See AUTO LIGHT/WIPER CONTROL MODULE REMOVAL/INSTALLATION.) 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.