Frelander 2. Manual — part 446
Horn -
Torque Specifications
Description
Nm
lb-ft
Horn bracket
25
18
Horn nut
10
7
Horn - Horn
Description and Operation
COMPONENT LOCATION
Item
Part Number
Description
1
-
Central Junction Box (CJB)
2
-
Horn switches
3
-
Relay R10 (Battery Junction Box (BJB))
4
-
Horns
OVERVIEW
The vehicle horns are operated by pressing either of the vertical bars mounted on the steering wheel. Horn switch status is
monitored by the CJB via the steering wheel module. When either of the switches is pressed the CJB energizes the horn
relay (relay R10), which is located within the BJB. The energized horn relay provides a battery feed to the 2 vehicle horns.
Both horns are mounted on brackets and secured to the center of the front cross member, forward of the radiator.
The vehicle horns will also sound if the anti-theft alarm system is activated. If this occurs, operation of the vehicle horns
is controlled automatically by the CJB.
For additional information, refer to:
Anti-Theft - Active
(419-01A Anti-Theft - Active, Description and Operation).
Horn - Horn
Diagnosis and Testing
Principles of Operation
For a detailed description of the horn system, refer to the relevant Description and Operation section in the workshop
manual.
REFER to:
Horn
(413-06 Horn, Description and Operation).
Inspection and Verification
CAUTION: Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does
not guarantee confirmation of a fault, and may also cause additional faults in the vehicle being tested and/or the donor
vehicle.
1. Verify the customer concern.
1.
2. Visually inspect for obvious signs of mechanical or electrical damage.
2.
Visual Inspection
Mechanical
Electrical
Horn switches
Clock spring/steering angle sensor
Horns
Fuses/relays (refer to electrical guide)
W iring harness
Correct engagement of electrical connectors
Loose or corroded connections
Central Junction Box (CJB)
Battery Junction Box (BJB)
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before
proceeding to the next step.
3.
4. If the cause is not visually evident, check CJB for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index.
4.
DTC Index
• NOTE: If the control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the
Warranty Policy and Procedures manual (section B1.2), or determine if any prior approval programme is in operation, prior
to the installation of a new module/component.
• NOTE: Generic scan tools may not read the codes listed, or may read only five digit codes. Match the five digits from the
scan tool to the first five digits of the seven digit code listed to identify the fault (the last two digits give extra
information read by the manufacturer-approved diagnostic system).
• NOTE: When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to three decimal
places and with a current calibration certificate. W hen testing resistance, always take the resistance of the DMM leads into
account.
• NOTE: Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
• NOTE: If DTCs are recorded and, after performing the pinpoint tests, a fault is not present, an intermittent concern may
be the cause. Always check for loose connections and corroded terminals.
DTC
Description
Possible Cause
Action
B1C5512 Horn Relay Coil Circuit -
circuit short to power
Horn relay control circuit -
short to power
Refer to electrical circuit diagrams and check
horn relay control circuit for short to power
B1C5514 Horn Relay Coil Circuit- circuit
short to ground or open
Horn relay control circuit -
short to ground, open circuit
Refer to electrical circuit diagrams and check
horn relay control circuit for short to ground,
open circuit
U012600 Lost Communication With
Steering Angle Sensor Module
Lost communication with
steering angle sensor
Carry out the associated network test for this
DTC using the manufacturer approved
diagnostic system
Horn - Horn
Removal and Installation
Removal
1.
WARNING: Do not work on or under a vehicle supported only
by a jack. Always support the vehicle on safety stands.
Raise and support the vehicle.
1.
Remove the front wheels and tires.
Refer to:
Wheel and Tire
(204-04 W heels and Tires, Removal and
Installation).
2.
Remove the front bumper cover.
Refer to:
Front Bumper Cover
(501-19 Bumpers, Removal and
Installation).
3.
Torque: 10 Nm
4.
Installation
To install, reverse the removal procedure.
1.
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