Jaguar XJ (X350). Service manual — part 1178
Speed Control - VIN Range: G45704-
>G99999
Principles of Operation
There are two types of speed (cruise) control fitted, adaptive cruise control (ACC) and non-adaptive
cruise control.
For additional information on the operation of either system,
Speed Control - VIN Range: G45704->G99999
Inspection and verification
1 . Verify the customer concern.
2 . Confirm which, if any, warning lights and/or messages were displayed on the instrument cluster.
NOTE:
For information on the messages displayed, refer to the owner handbook.
3 . Visually inspect for obvious signs of mechanical or electrical damage.
Mechanical
Electrical
Forward looking radar (FLR) sensor
levelling
Obstructions in the way of the FLR
sensor
Fuses/Relays
Damaged, Loose or Corroded Connector(s)
Damage to Wiring Loom/Incorrect Location, Stretched
or Taught
4 . If an obvious cause for an observed or reported concern is found, correct the cause (if possible)
before proceeding to the next step.
5 . If the cause is not visually evident use the Jaguar approved diagnostic system or a scan tool to
retrieve the fault codes before proceeding to the DTC index or the symptom chart if no DTCs are set.
Forward looking radar (FLR) sensor levelling
An incorrectly aligned FLR sensor can cause incorrect system operation. Before starting any repair
work on the ACC system, check the levelling of the FLR sensor. This is carried out in a similar way to
the module levelling in previous systems.
Speed Control Module Alignment - VIN Range: H18680->H99999
Symptom Chart
Symptom
Possible source
Action
Speed control inhibited or
disabled
Default mode enabled
Supply voltage to ACC
module
Supply voltage to FLR
sensor
Steering wheel speed
control switch(es)
Steering wheel speed
control switch
circuit
Throttle sensors
Brake cancel switch
Check message center for default
message.
For ACC module circuit tests, GO to
Pinpoint Test G532451p8.
For FLR sensor circuit tests, GO to
Pinpoint Test G532451p8.
For steering wheel speed control
switch tests, GO to Pinpoint Test
G532451p9.
For steering wheel speed control
switch circuit tests, GO to Pinpoint
Test G532451p9.
For 3.0 L engine throttle position
sensor tests,
Electronic Engine Controls - VIN
Range: G45704->G99999
For 3.5 and 4.2 L engine throttle
position sensor tests,
Electronic Engine Controls - VIN
Range: G45704->G99999
For brake cancel switch tests, GO to
Pinpoint Test G532451p10.
Unable to regulate/adjust
vehicle speed
Steering wheel switch
malfunction
For speed control switch circuit tests,
GO to Pinpoint Test G532451p9.
For speed control switch input signal
tests, GO to Pinpoint Test
G532451p9.
Unable to cancel speed
control from steering wheel
Steering wheel switch
malfunction
For speed control switch circuit tests,
GO to Pinpoint Test G532451p9.
For speed control switch input signal
tests, GO to Pinpoint Test
G532451p9.
Unable to cancel speed
control from brake pedal
Brake cancel switch
malfunction
For brake cancel switch tests, GO to
Pinpoint Test G532451p10.
www.
Diagnostic trouble code (DTC) index
CAUTION: When probing connectors to take measurements in the course of the pinpoint
tests, use the adaptor kit, part number 3548-1358-00
NOTE:
If the control module/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 program is in operation, prior to the installation of a new module.
NOTE:
When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to
three decimal places and with a current calibration certificate. When testing resistance, always
take the resistance of the DMM leads into account.
NOTE:
Check and rectify basic faults before beginning diagnostic routines that involve pinpoint tests.
NOTE:
Inspect connectors for signs of water ingress, and pins for damage and/or corrosion.
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 Source
Action
C1291
ACC Module
Overheated
Forward Looking Radar
(FLR) sensor is too
warm or too cold
FLR sensor failure
Carry out any pinpoint tests associated
with this DTC using the manufacturer
approved diagnostic system. CLEAR the
DTC. TEST the system for correct
operation. If the DTC returns, INSTALL a
new FLR sensor.
C1292
ACC Blockage
Detection
Forward Looking Radar (FLR)
sensor is blocked
Remove any blockages (snow/leaves etc)
from the FLR sensor. CLEAR the DTC.
TEST the system for normal operation. If
the DTC returns, INSTALL a new FLR
sensor.
C1293
ACC Alignment
Offset Angle Out of
Range
Sensor requires
mechanical levelling
Forward Looking Radar
(FLR) sensor is in
service alignment
mode
Carry out any pinpoint tests associated
with this DTC using the manufacturer
approved diagnostic system. Check FLR
sensor levelling. (This is done in a similar
way to control module alignment in
earlier systems). Complete service
alignment. Refer to the Jaguar approved
diagnostic system.
C1294
ACC Active Speed
Out of Range
Speed related fault with
the engine control
module (ECM),
transmission control
module (TCM),
dynamic suspension
control module
(DSCM), or
instrument cluster
modules
ACC module failure
Carry out any pinpoint tests associated
with this DTC using the manufacturer
approved diagnostic system. Carry out a
full vehicle DTC check. Check the ECM,
TCM, DSCM, or instrument cluster
modules for stored codes. If no DTCs are
indicated in the ECM, TCM, DSCM, or
instrument cluster modules, INSTALL a
new ACC module.
C1459
Adaptive Mode
Switch - Circuit
Failure
Forward alert switch
failure
Forward alert switch to
ACC module circuit
short circuit to
power
Forward alert switch to
ACC module circuit
open circuit
Refer to electrical circuit diagrams, notes
and check the forward alert switch circuit
for failure. For forward alert switch
circuit tests, GO to Pinpoint Test
G532451p1.
C1748
Switch input Circuit -
Short to Ground
Forward alert switch
failure
Forward alert switch to
ACC module circuit
short circuit to
GROUND
Carry out any pinpoint tests associated
with this DTC using the manufacturer
approved diagnostic system. Refer to
electrical circuit diagrams, notes and
check the forward alert switch circuit for
short to ground. For forward alert switch
circuit tests, GO to Pinpoint Test
G532451p2.
www.
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