Aura L4-2.4L (2008)
Description and Operation
Data Link Communications Description and Operation (See: Description and Operation)
Electrical Information Reference
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Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics)
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Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
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Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics)
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Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
Scan Tool References
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information.
Circuit/System Testing
1. Ignition OFF, test for less than 1.0 ohm between the DLC ground circuit terminal 5 and ground.
‹› If greater than specified, test the ground circuit for open/high resistance.
2. Disconnect the X2 harness connector at the BCM.
3. Install a 3A fused jumper wire between the BCM serial data circuit terminal 55 and the DLC terminal 1.
4. Ignition ON, attempt to communicate with the BCM. Communication should be available.
Important: Allow communications for 5 seconds after connecting a module with the jumper to determine if communication is interrupted
or not.
‹› If no communication, test the serial data circuit terminal 55 of the BCM for a short to ground, short to voltage, or an open/high resistance. If
the circuit tests normal, replace the BCM.
5. Ignition OFF, install a 3A fused jumper wire between the BCM serial data circuit terminal 37 and the vehicle control interface module terminal 1.
6. Disconnect the X1 harness connector at the radio, if applicable.
7. Ignition ON, attempt to communicate with the theft deterrent control module (TDM), communication should not be available.
‹› If communication is established, test the radio serial data circuit terminal B10 for a short to voltage or a short to ground. If the circuit tests
normal, replace the radio.
8. Ignition OFF, disconnect the X2 harness connector at the HVAC control module, if applicable.
9. Ignition ON, attempt to communicate with the TDM, communication should not be available.
‹› If communication is established, test the HVAC control module serial data circuit terminal 1 for a short to voltage or a short to ground. If the
circuit test normal, replace the HVAC control module.
10. Ignition OFF, disconnect the harness connector at the TDM.
11. Ignition ON, attempt to communicate with the instrument panel cluster (IPC), communication should not be available.
‹› If communication is established, test the TDM serial data circuit terminal 6 for a short to voltage or a short to ground. If the circuit test normal,
replace the TDM.
12. Ignition OFF, disconnect the harness connector at the IPC.
13. Ignition ON, attempt to communicate with the BCM, communication should not be available.
‹› If communication is established, test the IPC serial data circuit terminal A8 for a short to voltage or a short to ground. If the circuit test normal,
replace the IPC.
14. Ignition OFF, disconnect the X3 harness connector at the VCIM, if applicable.
15. Ignition ON, attempt to communicate with the BCM, communication should not be available.
‹› If communication is established, test the VCIM serial data circuit terminal 7 for a short to voltage or a short to ground. If the circuit tests
normal, replace the VCIM.
16. Ignition OFF, remove the 3A fused jumper wire from the BCM terminal 37.
17. Ignition ON, test for less then 1 volt between the BCM serial data circuit terminal 37 and ground.
‹› If greater then the specified range, test the serial data circuit for a short to voltage.
18. Ignition OFF, test for less the 1 ohm between the BCM serial data circuit terminal 37 and ground.
