Tests AF
PINPOINT TEST AF: THE HORN IS INOPERATIVETest AF1-AF2:
Test AF3-AF4:
Test AF5-AF7:
Test AF8-AF9:
Test AF10-AF12:
Test AF12-AF14:
Normal Operation
The horn switches are grounded through the clockspring by circuit 31-GJ1 (BK/YE). The clockspring provides this ground signal to the instrument cluster through the horn switch on circuit 10-GJ9 (GY/OG). The horn relay control and switched B+ power circuits are supplied by auxiliary junction box fuse 4 (20A) through circuit 30-GJ7 (RD/BU). The horn relay ground is controlled by the front electronic module (FEM) through circuit 91S-GJ7 (BN/RD). When the horn switch is pressed, the instrument cluster sends the FEM a command signal over the standard corporate protocol (SCP) communication network, circuits 4-EG8 (GY/VT) and 5-EG8 (BU/WH) to ground the horn relay. The FEM supplies a ground, energizing the horn relay and supplying power to the horn through circuit 30S-GJ6 (RD/YE).
Possible Causes
- auxiliary junction box fuse: 4 (20A)
- circuit 10-GJ9 (GY/OG) open
- circuit 30-GJ7A (RD/BU) open or shorted to ground
- circuit 30-GJ7B (RD/BU) open or shorted to ground
- circuit 30S-GJ6 (RD/YE) open or shorted to ground
- circuit 31-GJ1 (BK/YE) open
- circuit 31 -GJ6 (BK/YE) open
- circuit 91S-GJ7 (BN/RD) open
- clockspring
- horn relay
- horn
- horn switches
- FEM
- instrument cluster