Vehicle Horn Does Not Sound

HORN: HORN SYSTEM: Vehicle Horn does not Sound
- Vehicle Horn does not Sound

DESCRIPTION

When the steering pad (horn button) is pressed, a signal is sent from the steering pad through the steering pad switch assembly with modulator (steering pad ECU) to the spiral cable. The spiral cable and front light ECU (front controller) communicate via the CAN line. The front light ECU (front controller) receives the signal and sends it to the vehicle horns, causing the horns to sound.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC

(a) Check for DTC Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC is not output.

HINT
If DTC B2484 is output, troubleshoot it first.

NG -- GO TO DTC CHART Horn System
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (HORN BUTTON)

(a) Using the Techstream, read the Data List Scan Tool Testing and Procedures.

Steering Pad Switch





OK:

ON (horn button is pressed) appears on screen.

NG -- INSPECT STEERING PAD (HORN BUTTON)
OK -- Continue to next step.

3. INSPECT HORN ASSEMBLY





(a) Remove the low pitched horn Removal or high pitched horn Removal.

(b) Apply battery voltage and check the operation of the horn.

OK:





Result





B -- REPLACE HIGH PITCHED HORN ASSEMBLY Removal

C -- REPLACE LOW PITCHED HORN ASSEMBLY Removal
A -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (FRONT LIGHT ECU - HORN)





(a) Disconnect the B14 ECU connector.

(b) Disconnect the B6*1 or B10*2 horn connector.

*1: for High Pitched Horn

*2: for Low Pitched Horn

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:

for High Pitched Horn





for Low Pitched Horn





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE FRONT LIGHT ECU (FRONT CONTROLLER)

5. INSPECT STEERING PAD (HORN BUTTON)





(a) Remove the steering pad Removal.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPLACE STEERING PAD (HORN BUTTON) Removal
OK -- Continue to next step.

6. CHECK STEERING PAD SWITCH ASSEMBLY WITH MODULATOR (OPERATION)

(a) Temporarily replace the steering pad switch with modulator assembly with a new or normally functioning one Removal.

(b) Check that the vehicle horns operate normally.

OK:

Vehicle horns operate normally.

NG -- REPLACE SPIRAL CABLE SUB-ASSEMBLY Removal

OK -- END (STEERING PAD SWITCH ASSEMBLY WITH MODULATOR IS FAULTY)