Circuit Description
The antenna enable/amplifier on signal is a class 2 signal sent from the radio through the rear seat audio (RSA) module, when equipped. The amplifier will reach full output capabilities 900 milliseconds after receiving this signal. The amplifier will then be capable of class 2 functions 60 milliseconds after being turned ON. This DTC will be set if the circuit is shorted to ground or battery.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1235 Amplifier On Signal Circuit
Conditions for Running the DTC
This test is run at least every 50 milliseconds.
Conditions for Setting the DTC
The failure must occur for at least 3 seconds.
Action taken when the DTC Sets
The antenna enable/amplifier on signal circuit becomes disabled, causing the controlled module to become inoperative.
Conditions for Clearing the DTC
The failure criteria is no longer detected for 50 milliseconds.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Radio/Audio System Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Do the local AM/FM stations come in clearly? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | |
Did you locate and correct the condition? | Go to Step 4 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | |
4 | Operate the system in order to verify the repair. Did you complete the repair? | System OK | -- |
