DTC B2501
Diagnostic Instructions
DTC Descriptor
DTC B2501 5A: Horn Switch Stuck
Diagnostic Fault Information
|
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
|
Horn Switch Signal
|
B2501 5A
|
2
|
2
|
--
|
|
Horn Control
|
2
|
2
|
1
|
--
|
|
Horn Switch Ground
|
--
|
2
|
2
|
--
|
|
Horn Ground
|
--
|
2
|
2
|
--
|
|
1. Horn Always On
2. Horn Inoperative
|
Circuit/System Description
The right steering wheel control switch monitors the horn switch
signal circuit, when the horn pad is pressed, the right steering
wheel control switch detects the drop in the horn switch signal
circuit and sends a serial data message to the underbonnet fuse
block which commands the horn to sound.
Conditions for Running the DTC
When the output is actively being requested by steering wheel
module.
Conditions for Setting the DTC
The steering wheel module detects a short to ground in the horn
switch signal circuit or a stuck horn switch for greater than
60 seconds.
Action Taken When the DTC Sets
The horn will continuously sound until it is disconnected or
when it overheats and becomes inoperative.
Conditions for Clearing the DTC
| • |
The DTC clears when the fault is no longer
detected. |
| • |
The current DTC will become history when the
request for the output is removed. |
| • |
The history DTC will clear after
50 consecutive fault-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Horn Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Horns System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Horn Relay Status parameter
while pressing and releasing the horn pad, the reading should
change from On to Off.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the
right steering wheel control switch.
- Test for infinite resistance between the signal
circuit terminal 2 and the low reference circuit
terminal 1.
| ⇒ |
If not the specified value, test the signal
circuit for a short to ground. If the circuit tests normal, check
for a sticking horn switch. |
- Ignition ON, verify the scan tool Horn Relay Status
parameter is Off.
| ⇒ |
If not the specified value, replace the right
steering wheel control switch. |
- If all circuits test normal, replace the horn
switch.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
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