B1045

DTC B1045

CIRCUIT DESCRIPTION
The radio head unit provides four discrete channels to the speakers. Each channel consists of two wires that connect to a speaker. During normal operation, the radio applies approximately 1/2 of battery voltage to the positive (+) and negative (-) terminals at the speaker. The terminals attach to the speaker voice coil.

The audio sound that is heard, music and talking, is produced by a small AC voltage that moves the speaker cones back and forth producing the sound.

DTC DESCRIPTORS




This diagnostic procedure supports the following DTC:
DTC B1025 Audio Output Circuit

This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description. DTC Symptom Description

CONDITIONS FOR RUNNING THE DTC

B1025 01 and 02
The following are conditions that must be present in order for the radio to enable the diagnostics.
- The radio is in the ACCESSORY, RUN, or RAP power mode.
- The system voltage is at least 9.0 volts and no more than 16.0 volts.

CONDITIONS FOR SETTING THE DTC
The following conditions are present for 250 ms or longer.

B1025 01
One of the speaker output circuits is shorted to battery.

B1025 02
One of the speaker output circuits is shorted to ground.

ACTION TAKEN WHEN THE DTC SETS
The radio disables all audio output to the speakers, producing no sound from the radio.

CONDITIONS FOR CLEARING THE DTC
- The conditions for setting the DTC are no longer present.
- A history DTC clears after 100 malfunction free ignition cycles.
- The radio receives the clear code command from the scan tool.

TEST DESCRIPTION

Step 1 - Step 6:

The numbers below refer to the step numbers on the diagnostic table.
2. This step verifies that the DTC is still present.
3. This step isolates the fault condition.