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Diagnostic Aids

A fault with the serial data circuit could be caused by one or more of the several control modules connected to this serial data circuit. Isolate the fault by disconnecting each control module, one at a time, until serial data communication is restored.

DTC 14 - No Serial Data Diagnostic Chart

Step Action Value(s) 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 Data 1 display.
Does the Tech 2 display BCM information?		 - Go to Step 3  Go to Scan Tool Does Not Communicate with UART Device
3 Attempt to communicate with the body control module (BCM), engine control module (ECM), powertrain interface module (PIM) and instrument panel (I/P).
Were you able to make contact with the specified modules?		 - Go to Step 6  Go to Step 4 
4 Using an ohmmeter, back probe the BCM connector 2 Primary universal asynchronous receiver transmitter (UART) Serial Data circuit and the Secondary UART Serial Data circuits.
Is the value as specified?		 Less than 10 Ω Go to Step 5  Go to Step 8 
5 Inspect the Secondary UART Serial Data circuit for an open, short to ground or short to voltage between the BCM and individual control modules. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and complete the repair?		 - Go to Step 9  Go to Step 8 
6 Inspect the Secondary UART Serial Data circuit between the BCM and the I/P for continuity.
Is continuity present?		 - Go to Step 9  Go to Step 8 
7 Inspect instrument cluster ground circuit for continuity to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 10  -
8 Repair the open or high resistance in the Secondary UART Serial Data circuit between the powertrain control module (PCM) and the PIM. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 10  -
9 Replace the BCM. Refer to Body Control Module Replacement in Body Control Systems.
Did you complete the replacement?		 - Go to Step 10  -
10
  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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