Diagnostic Test

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN
1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
3. NOTE: A front door must remain open whenever checking or erasing Radio DTCs.
4. With the scan tool, perform an ECU reset to the Radio, and then erase DTCs.
5. Turn the ignition off for a minimum of 10.0 seconds.
6. Turn the ignition on.
7. Turn the Radio on and set the volume to 25.
8. Adjust the speakers to the front and center.
9. With the scan tool, read the active Radio DTCs.
NOTE:
A front door must remain open whenever checking or erasing Radio DTCs.

Did the DTC return?

Yes
- Go To 2
No
- Perform the appropriate INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE ANTENNA CONNECTION
1. Turn the ignition off.
2. Disconnect the FM2 Diversity Antenna connector at the back of the Radio.
3. Inspect the FM2 Diversity Antenna connections.
  Are the Antenna connections clean and secure?
  
  Yes
  - Go To 3
  No
  - Repair the Antenna connection as needed.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
ANTENNA INSPECTION
1. Using Service Information locate and verify the antenna is on the vehicle.
2. Visually inspect the Antenna for damage.
  Is the antenna missing or damaged?
  
  Yes
  - Replace the FM2 Diversity Antenna in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4
CHECK THE ANTENNA CONNECTIONS
1. Turn the ignition off.
2. Disconnect the FM2 Diversity Antenna connector at the Antenna.
3. Disconnect the FM2 Diversity Antenna connector at the rear of the Radio.
4. Inspect both of the FM2 Diversity Antenna connections and verify the Antenna is torqued to specification.
  Were the antenna connections clean and torqued to specification?
  
  Yes
  - Go To 5
  No
  - Clean the FM2 Diversity Antenna connection(s) / torque to specification as necessary.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE ANTENNA AND CABLE
NOTE:
Antenna reception testing

must

be done outside and away from man made structures or natural features to ensure all signals are not obstructed.
1. Connect the (special tool #9977-6-FM, Antenna) to the antenna connection on the back of the Radio.
2. Make sure one of the front doors is still open.
3. Turn the ignition on.
4. With the scan tool, perform an ECU reset to the Radio, and then erase DTCs.
5. Turn the ignition off for a minimum of 10.0 seconds.
6. Turn the ignition on.
7. Turn the Radio on.
8. Using the scan tool, read the active Radio DTCs.
  Is the DTC active?
  
  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
  - Go To 6
TEST THE ANTENNA CABLE
NOTE:
Antenna reception testing

must

be done outside and away from man made structures or natural features to ensure all signals are not obstructed.
1. Disconnect the Antenna cable at the base.
2. Connect the appropriate (special tool #9977-6-1, Adapter) or (special tool #9977-6-3, Adapter) to the Antenna cable at the back of the Radio.
3. Connect the appropriate (special tool #9977-6-4, Jumper) or (special tool #9977-6-2, Jumper) to the Antenna cable at the Antenna base.
4. Measure the Resistance across the tool terminals.
  Is the resistance below 47.5 Ohms?
  
  Yes
  - Use the (special tool #9977-6, Kit, Radio Antenna Diagnostic) to locate the short to battery in the circuit, repair or replace the Antenna cable as necessary.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Antenna base in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .