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Diagnostic Aids

By manipulating the harnesses at the various connectors it is often possible to isolate the cause of the circuit interruption. This harness can then be removed and repaired. Inspected for any damage to the harness which could cause an intermittent open circuit or backed out terminals at the instrument cluster connectors, broken connector locks, improperly formed or damaged terminals. The multimeter allows continuity of the wiring harness secondary serial data bus circuit to be checked. If the fault cannot be found in the harness then the fault may lie in the BCM. Refer to Diagnostic Starting Point - Computer/Integrating Systems for further diagnosis.

DTC 9 - No Serial Data From BCM

Step Action Yes No
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Turn the ignition ON, with the engine OFF.
  3. With the scan tool, observe the body control module (BCM) Data display.
Does the Tech 2 display BCM information?		 Go to Step 3  Go to Scan Tool Does Not Communicate with UART Device
3
  1. Turn the ignition OFF.
  2. Remove the instrument cluster. Refer to Instrument Panel Cluster (IPC) Replacement .
  3. Gain access to the BCM. Refer to Body Control Module Replacement
  4. Check continuity of the universal asynchronous receiver transmitter (UART) circuit between the BCM and the instrument panel (I/P). Refer to Circuit Testing
Is continuity present?		 Go to Step 4  Go to Step 6 
4 Check the UART circuit between the BCM and the I/P for a short to ground. Refer to Circuit Testing .
Is a short present?		 Go to Step 7  Go to Step 5 
5 Check the UART circuit between the BCM and the I/P for a short to voltage. Refer to Circuit Testing .
Is a short present?		 Go to Step 8  Go to Step 9 
6 Repair the open or high resistance in the ground in the UART circuit between the electronic brake control module (EBCM) and the I/P. Refer to Wiring Repairs .
Did you complete the repair?		 Go to Step 9  -
7 Repair the short to ground in the ground in the UART circuit between the EBCM and the I/P. Refer to Wiring Repairs .
Did you complete the repair?		 Go to Step 9  -
8 Repair the short to voltage in the ground in the UART circuit between the EBCM and the I/P. Refer to Wiring Repairs .
Did you complete the repair?		 Go to Step 9  -
9
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
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