Diagnostic Test

CHECK FOR ACTIVE DTC
NOTE:
Verify the connection of the Rearview Mirror harness connector.
1. Turn the ignition on.
2. With the scan tool, read the active DTCs.
  Does the scan tool display: B143A-1A -MICROPHONE 1 - CIRCUIT RESISTANCE BELOW THRESHOLD?
  
  Yes
  - Go To 2
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE INSIDE REARVIEW MIRROR
1. Turn the ignition off.
2. Disconnect the Inside Rearview Mirror harness connector.
3. Turn the ignition on.
4. With the scan tool, read the active DTCs.
  NOTE:
  B143A-1A -MICROPHONE 1 - CIRCUIT RESISTANCE BELOW THRESHOLD should display as active as a result of this test.
  
  Does the scan tool display: B143A-1A -MICROPHONE 1 - CIRCUIT RESISTANCE BELOW THRESHOLD as active?
  
  Yes
  - Go To 3
  No
  - Replace the Inside Rearview Mirror in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (X712) MICROPHONE 1 IN (+) AND THE (X792) MICROPHONE 1 IN (-) CIRCUITS FOR A SHORT TOGETHER
1. Turn the ignition off.
2. Disconnect the RADIO harness connector.
3. Measure the resistance between the (X712) Microphone 1 IN (+) circuit, and the (X792) Microphone 1 IN (-) circuit.
  Is the resistance below 10K Ohms?
  
  Yes
  - Repair the (X712) Microphone 1 IN (+) and the (X792) Microphone 1 IN (-) circuits for a short together.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the RADIO in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .