B1025 01

B1025 01, B1025 02

B1025 01: Audio/Speaker Output Circuit FL, Short to B+

B1025 02: Audio/Speaker Output Circuit FL, Short to Ground

Fault symptoms

No sound front left.

Type of diagnosis

Continuous.

Enable criteria

Ignition ON.
Radio/CD switched on
Battery voltage between 9 and 16V (+/- 1V).

Fault criteria

01 Line/speaker output of the front left speaker is short circuited to B+.
02 Line/speaker output of the front left speaker is short circuited to ground.

Diagnostic help

voltage level of the output is:
- Radio system 1 -> 10V
- Radio system 2/3 -> 3-4V

Fault-related functions in the diagnostic tool

Test value: Battery voltage
Activation: Speaker test

Checking the wiring harness

Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Check switches, connectors and crimp connections for oxidation, withdrawn pins and pin clamping force.

Fault Diagnosis Procedure