Land Rover Discovery: Trailer Lamps
PRINCIPLES OF OPERATION
For a detailed description of the Trailer Lamps, refer to the relevant
Description and Operation section in the workshop manual. REFER to:
Exterior Lighting (417-01 Exterior Lighting, 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.
NOTES:
- Verify the customer concern
- Visually inspect for obvious signs of damage and system integrity
Visual Inspection
- If an obvious cause for an observed or reported concern is found,
correct the cause (if possible) before proceeding to the next step
- If the cause is not visually evident, verify the symptom and refer to
the
Symptom Chart, alternatively check for Diagnostic Trouble Codes
(DTCs) and refer to the DTC Index
- Check DDW for open campaigns. Refer to the corresponding bulletins
and SSMs which may be valid for the specific customer complaint and
carry out the recommendations as required
SYMPTOM CHART
SYMPTOM:
Trailer stop
lamp(s)
inoperative
POSSIBLE CAUSE:
- Body system fault
- Trailer stop lamp
circuit short circuit to
ground, short circuit
to power, open circuit,
high resistance
ACTION:
- Using the Jaguar Land Rover approved
diagnostic equipment, check the central
junction box for related DTCs and refer to
the relevant DTC index
- Refer to the electrical circuit diagrams and
check the trailer stop lamp circuit for short
circuit to ground, short circuit to power, open
circuit, high resistance. Repair the wiring
harness as necessary
SYMPTOM:
Trailer stop
lamp(s)
dim
POSSIBLE CAUSE:
- Body system fault
- Trailer stop lamp
circuit high resistance
ACTION:
- Using the Jaguar Land Rover approved
diagnostic equipment, check the central
junction box for related DTCs and refer to
the relevant DTC index
- Refer to the electrical circuit diagrams and
check the trailer stop lamp circuit for high
resistance. Repair the wiring harness as
necessary
SYMPTOM:
Trailer stop
lamp(s)
stuck on
POSSIBLE CAUSE:
- Body system fault
- Trailer stop lamp
circuit short circuit to
power
ACTION:
- Using the Jaguar Land Rover approved
diagnostic equipment, check the central
junction box for related DTCs and refer to
the relevant DTC index
- Refer to the electrical circuit diagrams and
check the trailer stop lamp circuit for short
circuit to power. Repair the wiring harness as
necessary
SYMPTOM:
Trailer fog
lamp(s)
inoperative
POSSIBLE CAUSE:
- Body system fault
- Trailer fog lamp circuit
short circuit to
ground, short circuit
to power, open circuit,
high resistance
ACTION:
- Using the Jaguar Land Rover approved
diagnostic equipment, check the central
junction box for related DTCs and refer to
the relevant DTC index
- Refer to the electrical circuit diagrams and
check the trailer fog lamp circuit for short
circuit to ground, short circuit to power, open
circuit, high resistance. Repair the wiring harness as necessary
SYMPTOM:
Trailer fog
lamp(s)
dim
POSSIBLE CAUSE:
- Body system fault
- Trailer fog lamp circuit
high resistance
ACTION:
- Using the Jaguar Land Rover approved
diagnostic equipment, check the central
junction box for related DTCs and refer to
the relevant DTC index
- Refer to the electrical circuit diagrams and
check the trailer fog lamp circuit for high
resistance. Repair the wiring harness as
necessary
SYMPTOM:
Trailer fog
lamp(s)
stuck on
POSSIBLE CAUSE:
- Body system fault
- Trailer fog lamp circuit
short circuit to power
ACTION:
- Using the Jaguar Land Rover approved
diagnostic equipment, check the central
junction box for related DTCs and refer to
the relevant DTC index
- Refer to the electrical circuit diagrams and
check the trailer fog lamp circuit for short
circuit to power. Repair the wiring harness as
necessary
SYMPTOM:
Trailer tail /
license
plate
lamp(s)
inoperative
POSSIBLE CAUSE:
- Body system fault
- Trailer tail / license
plate lamp circuit
short circuit to
ground, short circuit
to power, open circuit,
high resistance
ACTION:
SYMPTOM:
Trailer tail /
license
plate
lamp(s)
dim
POSSIBLE CAUSE:
- Body system fault
- Trailer tail / license
plate lamp circuit high
resistance
ACTION:
- Using the Jaguar Land Rover approved
diagnostic equipment, check the central
junction box for related DTCs and refer to
the relevant DTC index
- Refer to the electrical circuit diagrams and
check the trailer tail / license plate lamp
circuit for high resistance. Repair the wiring
harness as necessary
SYMPTOM:
Trailer tail /
license
plate
lamp(s)
stuck on
POSSIBLE CAUSE:
- Body system fault
- Trailer tail / license
plate lamp circuit
short circuit to power
ACTION:
- Using the Jaguar Land Rover approved
diagnostic equipment, check the central
junction box for related DTCs and refer to
the relevant DTC index
- Refer to the electrical circuit diagrams and
check the trailer tail / license plate lamp
circuit for short circuit to power. Repair the wiring harness as necessary
SYMPTOM:
Trailer turn
signal
indicator
lamp(s)
inoperative
POSSIBLE CAUSE:
- Body system fault
- Trailer turn signal
indicator lamp circuit
short circuit to
ground, short circuit
to power, open circuit,
high resistance
ACTION:
SYMPTOM:
Trailer turn
signal
indicator
lamp(s)
dim
POSSIBLE CAUSE:
- Body system fault
- Trailer turn signal
indicator lamp circuit
high resistance
ACTION:
- Using the Jaguar Land Rover approved
diagnostic equipment, check the central
junction box for related DTCs and refer to
the relevant DTC index
- Refer to the electrical circuit diagrams and
check the trailer turn signal indicator lamp
circuit for high resistance. Repair the wiring
harness as necessary
SYMPTOM:
Trailer turn
signal
indicator
lamps
stuck on
POSSIBLE CAUSE:
- Body system fault
- Trailer turn signal
indicator lamp circuit
short circuit to power
ACTION:
- Using the Jaguar Land Rover approved
diagnostic equipment, check the central
junction box for related DTCs and refer to
the relevant DTC index
- Refer to the electrical circuit diagrams and
check the trailer turn signal indicator lamp
circuit for short circuit to power. Repair the
wiring harness as necessary
SYMPTOM:
Trailer
reverse
lamp(s)
inoperative
POSSIBLE CAUSE:
- Body system fault
- Trailer reverse lamp
circuit short circuit to
ground, short circuit
to power, open circuit,
high resistance
ACTION:
- Using the Jaguar Land Rover approved
diagnostic equipment, check the central
junction box for related DTCs and refer to
the relevant DTC index
- Refer to the electrical circuit diagrams and
check the trailer reverse lamp circuit for short
circuit to ground, short circuit to power, open
circuit, high resistance. Repair the wiring
harness as necessary
SYMPTOM:
Trailer
reverse
lamp(s)
dim
POSSIBLE CAUSE:
- Body system fault
- Trailer reverse lamp
circuit high resistance
ACTION:
- Using the Jaguar Land Rover approved
diagnostic equipment, check the central
junction box for related DTCs and refer to
the relevant DTC index
- Refer to the electrical circuit diagrams and
check the trailer reverse lamp circuit for high resistance. Repair the
wiring harness as
necessary
SYMPTOM:
Trailer
reverse
lamp(s)
stuck on
POSSIBLE CAUSE:
- Body system fault
- Trailer reverse lamp
circuit short circuit to
power
ACTION:
- Using the Jaguar Land Rover approved
diagnostic equipment, check the central
junction box for related DTCs and refer to
the relevant DTC index
- Refer to the electrical circuit diagrams and
check the trailer reverse lamp circuit for short
circuit to power. Repair the wiring harness as
necessary
SYMPTOM:
Warning
indicator(s)
inoperative
POSSIBLE CAUSE:
- Body system fault
- Instrument cluster
fault
ACTION:
- Using the Jaguar Land Rover approved
diagnostic equipment, check the central
junction box for related DTCs and refer to
the relevant DTC index
- Using the Jaguar Land Rover approved
diagnostic equipment, check the instrument
cluster for related DTCs and refer to the
relevant DTC index
SYMPTOM:
Trailer
connector
power
(battery)
circuit
inoperative
POSSIBLE CAUSE:
- Trailer connector
power (battery) circuit
short circuit to
ground, open circuit,
high resistance
ACTION:
- Refer to the electrical circuit diagrams and
check the trailer connector power (battery)
circuit for short circuit to ground, open
circuit, high resistance. Repair the wiring
harness as necessary
SYMPTOM:
Trailer
connector
power
(ignition)
circuit
inoperative
POSSIBLE CAUSE:
- Trailer connector
power (ignition) circuit
short circuit to
ground, open circuit,
high resistance
ACTION:
- Refer to the electrical circuit diagrams and
check the trailer connector power (ignition)
circuit for short circuit to ground, open
circuit, high resistance. Repair the wiring
harness as necessary
DTC INDEX
For a list of Diagnostic Trouble Codes (DTCs) that could be logged on this
vehicle, please refer to Section 100-00. REFER to: Diagnostic Trouble Code
Index - DTC: Central Junction Box (CJB) (100-00 General Information,
Description and Operation).
READ NEXT:
PRINCIPLES OF OPERATION
For a detailed description of the Turn Signal and Hazard Lamps, refer to the
relevant Description and Operation section in the workshop manual. REFER
to: Exterior Lighting (417
REMOVAL
NOTES:
Removal steps in this procedure may contain installation details.
Some variation in the illustrations may occur, but the essential
information is always correct.
Left illustration
SEE MORE:
Microphone - Left Hand Drive (LHD) vehicles
Microphone - Right Hand Drive (RHD) vehicles
Telematics speaker
Emergency call (eCall) switch
Breakdown call (bCall) switch
The front overhead console houses the Breakdown call (bCall)
and
Emergency call (eCall) switches, microphone and Telematic
When the Progress control system is
enabled, the desired target (set) speed for
the vehicle can be set and adjusted via
the Cruise control buttons, mounted on
the right side of the steering wheel
SET+: While the vehicle is moving,
press to enable the Progress control
system, to recognise that th