Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
Verify the connection of the Front Roof Lamp Unit harness connector.
1. Turn the ignition on.
2. With the scan tool, read Radio DTCs and record on the repair order.
3. With the scan tool, erase DTCs.
4. With the scan tool, read Radio DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE FRONT ROOF LAMP UNIT
1. Turn the ignition off.
2. Disconnect the Front Roof Lamp Unit harness connector
3. Connect a jumper wire between the Microphone 1 IN (-) and the Microphone 1 IN (+) circuits at the rearview mirror harness connector.
4. Turn the ignition on.
5. With the scan tool, read Radio DTCs.
  NOTE:
  B143A-2B-MICROPHONE 1 - WIRES SHORTED TOGETHER should display as a result of this test.
  
  Does the scan tool display: B143A-13-MICROPHONE 1 - CIRCUIT OPEN?
  
  Yes
  - Go To 3
  No
  - Replace the Front Roof Lamp Unit in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE MICROPHONE 1 IN (+) CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Radio C1 harness connector.
3. Measure the resistance of the Microphone 1 IN (+) circuit between the Inside Rearview Mirror and the Radio C1 harness connectors.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the Microphone 1 IN (+) circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE MICROPHONE 1 IN (-) CIRCUIT FOR AN OPEN
1. Measure the resistance of the Microphone 1 IN (-) circuit between the Inside Rearview Mirror and the Radio C1 harness connectors.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the Microphone 1 IN (-) circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all Radio 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 Radio 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 Radio DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Radio in accordance with the Service information. Refer to RADIO, 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.