B1578-1A

B1578-1A -AUDIO ANTENNA - CIRCUIT RESISTANCE BELOW THRESHOLD

Special Tools:










For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
With the ignition on and the Radio in seek mode.

- Set Condition:
The Radio detects that the Antenna circuit is shorted together for greater than 10 seconds.





Diagnostic Test

1. CHECK THE ANTENNA CONNECTION
1. Turn the ignition off.
2. Disconnect the Antenna connector at the back of the Radio.
3. Inspect the Antenna connections.

Are the Antenna connections clean and secure?

Yes

- Go To 2

No

- Repair the Antenna connection as needed.
- Perform the BODY VERIFICATION TEST. Body Verification Test .

2. CHECK THE ANTENNA AND CABLE
1. Connect the (9977-6-FM) to the antenna connection on the back of the Radio.
2. Make sure one of the front doors is still open.
3. Using the scan tool, erase the DTCs.
4. Turn the ignition on.
5. Turn the Radio on.
6. Using the scan tool, read the active Radio DTCs.

Does the scan tool read: B1578-1A -AUDIO ANTENNA - CIRCUIT RESISTANCE BELOW THRESHOLD as active?

Yes

- Replace the Radio. Radio - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test .

No

- Go To 3

3. TEST THE ANTENNA CABLE
1. Disconnect the Antenna cable at the base.
2. Connect the appropriate (9977-6-1) or (9977-6-3) to the Antenna cable at the back of the Radio.
3. Connect the appropriate (9977-6-4) or (9977-6-2) 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 (9977-6) to locate the short together, repair or replace the Antenna cable as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test .

No

- Replace the Antenna base.
- Perform the BODY VERIFICATION TEST. Body Verification Test .