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OBD - Multiplex Communication System

PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION

System Wiring Diagram:





PCM
1. Inspect the display of DTC U0121 and/or U0155, using the WDS or equivalent. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)




2. Referring to the given table, determine the malfunctioning part of the CAN system.

EHPAS control Module

1. Inspect the display of DTC U0100 and/or U2023 using the WDS or equivalent. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM]).




2. Referring the given table determine the malfunctioning of the CAN system.

ABS HU/CM
1. Inspect the display of DTC U1900 using the WDS or equivalent. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)




2. Referring to the given table, determine the malfunctioning part of the CAN system.

TPMS Control Module
1. Inspect the display of DTC U1900 using the WDS or equivalent.(See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)




2. Referring to the given table, determine the malfunctioning part of the CAN system.

Instrument Cluster
1. Inspect the display of DTC U0100, U0121, U0127 and/or U0131, using the WDS or equivalent. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)




2. Referring to the given table, determine the malfunctioning part of the CAN system.
3. Inspect the display of DTC U0140 and/or U0184, using the WDS or equivalent. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)




4. Referring to the given table, determine the malfunctioning part of the CAN system.

Climate Control Unit
1. Inspect the display of DTC U0140, U0155 and/or U0184, using the WDS or equivalent. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)




2. Referring to the given table, determine the malfunctioning part of the CAN system.

Information display
1. Inspect the display of DTC U0164, U0181 and/or U0184 using the input/output check mode. (See INFORMATION DISPLAY INPUT/OUTPUT CHECK MODE.)




2. Referring to the given table, determine the malfunctioning part of the CAN system.

Audio unit (Base module)
1. Inspect the display of DTC 17:Er11, 18:Er11 and/or 19:Er11 using the on-board diagnostic test mode.




2. Referring to the given table, determine the malfunctioning part of the CAN system.

BCM
1. Inspect the display of DTC U0100, 0155 and/or U0164 using the WDS or equivalent. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)




2. Referring to the given table, determine the malfunctioning part of the CAN system.

Repair Procedure
1. Inspect the connector of malfunctioning module.
- If there is any malfunction, repair or replace the connector.

2. Inspect the malfunctioning wiring harnesses as follow:
- If there is any malfunction, repair or replace the wiring harnesses.
- If there is no malfunction, replace the malfunctioning module.
- Short to GND
- Short to power supply
- Twisted pair short each other
- Open circuit

3. Make sure to reconnect all disconnected connectors.
4. Clear the CAN system related DTCs using the WDS or equivalent.
5. Verify if the CAN system related DTCs are displayed using the WDS or equivalent.
- If the same following DTCs are present, replace the malfunctioning module.
- U0073 (PCM, EHPAS control module, instrument cluster, BCM)
- U0516 (Climate control unit, TPMS control module)
- U2012(ABS HU/CM)
- U2516 (Instrument cluster, information display)
- 16:Er12 (Audio unit (base module))
- If other DTC is present, perform the appropriate DTC inspection. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)
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