Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read Body Control Module (BCM) DTCs and record on the repair order.
2. Record the Environmental Data.
3. With the scan tool, erase DTCs.
4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. With the scan tool, read BCM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR INTERMITTENT CONDITIONS procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK FOR ADDITIONAL DTCS
1. With the scan tool, read DTCs from all modules.
  Are there other Steering Column Control Module (SCCM) or LIN Bus related DTCs Active?
  
  Yes
  - Repair the Steering Column Control Module (SCCM) or LIN Bus related DTCs before proceeding with this diagnostic procedure.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK FOR VOLTAGE ON THE (A911) FUSED B(+) CIRCUIT
1. Turn the ignition off.
2. Disconnect the Speed Control Switch harness connector.
3. Turn the ignition on.
4. Measure the voltage on the (A911) Fused B(+) circuit at Speed Control Switch harness connector - terminal 1.
  Is the voltage above 9.0 volts?
  
  Yes
  - Go To 4
  No
  - Go To 7
CHECK THE (Z935) GROUND CIRCUIT FOR CONTINUITY TO GROUND
1. Turn the ignition off.
2. Check for continuity between ground and the (Z935) Ground circuit at Speed Control Switch harness connector - terminal 4.
  Is there continuity between ground and the (Z935) Ground circuit?
  
  Yes
  - Go To 5
  No
  - Go To 8
CHECK THE STEERING COLUMN CONTROL MODULE (SCCM) LIN BUS PASS-THROUGH
1. Disconnect the SCCM C4 harness connector.
2. Connect a fused jumper wire between ground and the (D404) LIN Bus 4 circuit at SCCM C4, component side - terminal 9.
3. Turn the ignition on.
4. With the scan tool, read BCM DTCs.
  Is DTC: U1046-00-LIN 4 BUS set as Active?
  
  Yes
  - Go To 9
  No
  - Go To 6
CHECK THE BCM FOR PROPER OPERATION
1. Turn the ignition off.
2. Remove the fused jumper wire from the SCCM.
3. Disconnect the SCCM C2 harness connector.
4. Connect a fused jumper wire between ground and the (D404) LIN Bus 4 circuit at SCCM C2 harness connector - terminal 2.
5. Turn the ignition on.
6. With the scan tool, read BCM DTCs.
  Is DTC: U1046-00-LIN 4 BUS set as Active?
  
  Yes
  - Replace the Steering Column Control Module (SCCM) in accordance with the Service Information. Refer to MODULE, STEERING COLUMN CONTROL (SCCM), REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 10
CHECK THE (A911) FUSED B(+) CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the SCCM C4 harness connector.
3. Measure the resistance of the (A911) Fused B(+) circuit between Speed Control Switch harness connector - terminal 1 and SCCM C4 harness connector - terminal 3.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the open in the (A911) Fused B(+) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Steering Column Control Module (SCCM) in accordance with the Service Information. Refer to MODULE, STEERING COLUMN CONTROL (SCCM), REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Z935) GROUND CIRCUIT FOR AN OPEN
1. Disconnect the SCCM C4 harness connector.
2. Measure the resistance of the (Z935) Ground circuit between Speed Control Switch harness connector - terminal 4 and SCCM C4 harness connector - terminal 1.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the open in the (Z935) Ground circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Steering Column Control Module (SCCM) in accordance with the Service Information. Refer to MODULE, STEERING COLUMN CONTROL (SCCM), REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (D404) LIN BUS 4 CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Measure the resistance of the (D404) LIN Bus 4 circuit between SCCM C4 harness connector - terminal 9 and Speed Control Switch harness connector - terminal 2.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the open in the (D404) LIN Bus 4 circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Speed Control Switch in accordance with the Service Information. Refer to SWITCH, SPEED CONTROL, REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (D404) LIN BUS 4 CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the BCM C8/H harness connector.
3. Measure the resistance of the (D404) LIN Bus 4 circuit between SCCM C2 harness connector - terminal 2 and BCM C8/H harness connector - terminal 32.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the open in the (D404) LIN Bus 4 circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 11
CHECK RELATED BCM HARNESS CONNECTIONS
1. Disconnect all BCM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
5. Reconnect all BCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read BCM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  - Test complete.