Diagnostic Test

TEST FOR INTERMITTENT CONDITION
NOTE:
Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.
1. Turn the ignition on.
  NOTE:
  Make sure the battery voltage is between 10.0 and 16.0 volts.
2. With the scan tool, read the module status.
  NOTE:
  Check the BCM for any active CAN DTCs and perform the appropriate diagnostics before proceeding. Refer to: BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX .
  
  Does the scan tool indicate that the module is active on the bus?
  
  Yes
  - Perform the Stored Lost Communication DTCs diagnostic procedure. Refer to: STORED LOST COMMUNICATION DTCS .
  No
  - Go To 2
CHECK THE (A194) FUSED B (+) CIRCUIT FOR AN OPEN OR SHORT
1. Turn the ignition off.
2. Disconnect the Drivetrain Control Module C1 and C2 harness connectors.
3. Turn the ignition on.
4. Using a 12-volt test light connected to ground, check the (A194) Fused B (+) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3
  No
  - Repair the (A194) Fused B (+) circuit for an open or short.
  - Perform the DTCM VERIFICATION TEST. Refer to: DTCM VERIFICATION TEST .
CHECK THE (F946) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR AN OPEN OR SHORT
1. Using a 12-volt test light connected to ground, check the (F946) Fused Ignition Switch Output (Run-Start) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the (F946) Fused Ignition Switch Output (Run-Start) circuit for an open or short.
  - Perform the DTCM VERIFICATION TEST. Refer to: DTCM VERIFICATION TEST .
CHECK THE (Z901) GROUND CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Using a 12-volt test light connected to 12-volts, check the (Z901) Ground circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 5
  No
  - Repair the (Z901) Ground circuit for an open.
  - Perform the DTCM VERIFICATION TEST. Refer to: DTCM VERIFICATION TEST .
CHECK THE (D301) CAN C(+) BUS CIRCUIT FOR AN OPEN
1. Disconnect the Star Can C Dash C12 harness connector and perform the CAN C DASH STAR CONNECTOR REMOVAL process. Refer to STANDARD PROCEDURE .
2. Measure the resistance of the (D301) CAN C Bus (+) circuit between the Star Can C Dash C12 harness connector and the DTCM C1 harness connector.
  Is the resistances below 5.0 Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (D301) CAN C(+) Bus circuit for an open.
  - Perform the DTCM VERIFICATION TEST. Refer to: DTCM VERIFICATION TEST .
CHECK THE (D302) CAN C(-) BUS CIRCUIT FOR AN OPEN
1. Measure the resistance of the (D302) CAN C Bus (-) circuit between the Star Can C Dash C12 harness connector and the DTCM C1 harness connector.
  Are the resistances below 5.0 Ohms?
  
  Yes
  - Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Refer to MODULE, DRIVETRAIN CONTROL (DTCM), REMOVAL and MODULE, DRIVETRAIN CONTROL (DTCM), INSTALLATION .
  - Perform the DTCM VERIFICATION TEST. Refer to: DTCM VERIFICATION TEST .
  No
  - Repair the (D302) CAN C(-) Bus circuit for an open.
  - Perform the DTCM VERIFICATION TEST. Refer to: DTCM VERIFICATION TEST .