DTC B1142
DTC B1142 : Power Window Master Switch Lost Communication with Front Passenger's Power Window Switch (UART Line Open)
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
| DTC Description | DTC |
|---|---|
| B1142 Power window master switch lost communication with front passenger's power window switch (UART line open) |
DTC (Door Multiplex Control Unit)
- Problem verification
-1. Clear the DTCs with the HDS.
-2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.
-3. Check for DTCs with the HDS.
DTC Description DTC B1142 Power window master switch lost communication with front passenger's power window switch (UART line open) Is DTC B1142 indicated?
YES
Go to step 2.
NO
Intermittent failure, the system is OK at this time.
- Open wire check (LIN (P/W) line)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the following connectors.
Power window master switch 37P connector Front passenger's power window switch 37P connector Moonroof motor-control unit 14P connector (with moonroof) -3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode
Power window master switch 37P connector: disconnected
Front passenger's power window switch 37P connector: disconnected
Moonroof motor-control unit 14P connector (with moonroof): disconnectedTest point 1 Test point 2 Connector Terminal Connector Terminal Power window master switch 37P connector No. 36 Front passenger's power window switch 37P connector No. 34 Power window master switch 37P connector No. 36 Moonroof motor-control unit 14P connector (with moonroof) No. 12 Is there continuity?
YES
The LIN (P/W) wire is not open. Go to step 3.
NO
Repair an open or high resistance in the wire.
- Determine possible failure area (LIN (P/W) line, others)
-1. Reconnect all the connectors.
Power window master switch 37P connector Front passenger's power window switch 37P connector Moonroof motor-control unit 14P connector (with moonroof) -2. Turn the vehicle to the ON mode.
-3. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Test point 1 Power window master switch 37P connector No. 36 Test point 2 Body ground Is there less than 0.2 V?
YES
Go to step 4.
NO
Go to step 6.
- Shorted wire check (LIN (P/W) line) 1
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the appropriate connector at each switch and control unit in the table one at a time.
Connector Front passenger's power window switch 37P connector Moonroof motor-control unit 14P connector (with moonroof) -3. Turn the vehicle to the ON mode.
-4. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Test point 1 Power window master switch 37P connector No. 36 Test point 2 Body ground Is there battery voltage?
-
YES
Internal circuit short. Replace the faulty switch or unit.
NO
Go to step 5.
-
- Shorted wire check (LIN (P/W) line) 2
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the following connector.
Power window master switch 37P connector -3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode
Power window master switch 37P connector: disconnected
Front passenger's power window switch 37P connector: disconnected
Moonroof motor-control unit 14P connector (with moonroof): disconnectedTest point 1 Power window master switch 37P connector No. 36 Test point 2 Body ground Is there continuity?
YES
Repair a short to ground in the wire.
NO
Power window master switch internal circuit short. Replace the power window master switch .
- Switch or unit check
-1. Open and close the front passenger's power window by operating the power window master switch.
-2. With moonroof: Open and close the moonroof by operating the moonroof switch.
Do the switches or unit work normally?
YES
Replace the power window master switch .
NO
Replace the faulty switch or unit.