Jaguar XJ (X350). Manual — part 1443

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 Causes

Action

B1940

Seat Memory
Position Out
Of Range

•

Seat movement motor
has moved beyond
expected limit

Ignore this DTC. Do not perform any
action if this DTC is flagged. If this
DTC is flagged within the DSM then
no action is required within the DSM
(Driver Seat Module). If this DTC is
flagged within the Rear Memory
Control Module (REAR MEMORY
CONTROL MODULE (REAR
MEMORY CONTROL MODULE
(RMM) then no action is required the
REAR MEMORY CONTROL
MODULE (REAR MEMORY
CONTROL MODULE (RMM).

B2147

Driver Seat
Switch Fault

•

Drivers seat module,
driver seat switch -
input short circuit to
power or switch
contact closed when
opposite switch
becomes closed

Refer to electrical circuit diagrams,
notes and check driver seat switch and
circuit for fault

B2171

LH Rear Seat
Switch Fault

•

Rear memory module,
left rear seat switch -
input short circuit to
power or switch
contact closed when
opposite switch
becomes closed

Refer to electrical circuit diagrams,
notes and check left rear seat switch
and circuit for fault

B2173

RH Rear Seat
Switch Fault

•

Rear memory module,
right rear seat switch -
input short circuit to

Refer to electrical circuit diagrams,
notes and check right rear seat switch
and circuit for fault

power or switch
contact closed when
opposite switch
becomes closed

B2207

ECU ROM
Checksum
Error

•

Program or EEPROM
memory is corrupted

Suspect the drivers seat module if this
DTC occurs within DSM or Rear
Memory Module if this DTC occurs
within REAR MEMORY CONTROL
MODULE (REAR MEMORY
CONTROL MODULE (RMM), check
and install a new module as required,
refer to the new module installation
note at the top of the DTC Index

B2309

Seat Motor
Out Of Range

•

Drivers seat module or
rear memory module,
seat axis has moved
beyond expected
limits - too many hall
pulses between end
stops

Check seat movement for correct
operation (DSM for driver seat
movement, REAR MEMORY
CONTROL MODULE (REAR
MEMORY CONTROL MODULE
(RMM) for Rear seat movement) if no
mechanical cause is found. Refer to
electrical circuit diagrams, notes and
check seat position sensor circuit for
fault. Recalibrate affected seats
memory positions using the
manufacturer approved process

Pinpoint Tests

PINPOINT TEST G1034557p1 : Front seat
fore/aft movement not functioning

G1034557t1 : Check for front seat forward-rearward seat
motor operation

1.

WARNING: Before work is carried out, make the air bag supplemental restraint

system safe. For additional information, refer to Standard Workshop Practices section
of workshop manual.

Set ignition status to ' ON'. 2. From the switch pack, operate the front seat forward-rearward
seat motor switch and listen for evidence of the motor operating.

www.

•

Does the motor operate?

-> Yes
GO to Pinpoint Test G1034557t2.


-> No
GO to Pinpoint Test G1034557t3.

G1034557t2 : Check front seat forward-rearward seat
motor drive bar

1. Check front seat drive bar for correct installation and condition

•

Is the front seat drive bar correctly installed and in a serviceable condition?

-> Yes
Re-check for correct front seat forward-rearward movement. Remove seat to allow for further
investigation if required.

-> No
Correctly install front seat forward-rearward seat motor drive bar, or replace if required.

G1034557t3 : Check front seat forward-rearward seat
motor

1. Set ignition status to 'OFF'. 2. Disconnect front seat forward-rearward seat motor
connector. 3. NOTE:

It may be that the seat has been driven to the limit of travel along the relevant axis, and
when the link harness is connected, the seat will remain in the same position. If this is the
case, a jolt may be felt from the motor. To confirm the motor operation, swap the link
harness to alternate motor pin connections and the seat should travel in the opposite
direction.

Using a locally made fused link harness and power supply, connect power and ground to
forward-rearward seat motor.

Battery positive terminal

Battery negative terminal

forward-rearward seat motor pin 1 forward-rearward seat motor pin 2

•

Does the motor operate?

-> Yes
Using manufacturer approved diagnostic system, check for related Diagnostic Trouble Codes
(DTCs) and carry out the repair operations specified. Alternatively, refer to the electrical
circuit diagrams and check front seat forward-rearward seat motor circuits.

-> No
Replace front seat forward-rearward seat motor. Refer to relevant section of workshop
manual.

PINPOINT TEST G1034557p2 : Front seat
excessive forward-rearward free play

G1034557t4 : Check front seat for excessive forward-
rearward free play

1.

WARNING: Before work is carried out, make the air bag supplemental restraint

system safe. For additional information, refer to Standard Workshop Practices section
of workshop manual.

Check all accessible front seat frame fixings are installed and to the correct torque.

•

Are all accessible front seat frame fixings installed and to the correct torque?

-> Yes
GO to Pinpoint Test G1034557t5.


-> No
Install and tighten all accessible front seat frame fixings to correct torque and re-check for
excessive free play.

G1034557t5 : Compare the front seat forward-rearward
free play against a similar seat

1. Compare the front seat forward-rearward free play against a similar seat.

•

Is the front seat forward-rearward free play excessive when compared to a
similar seat?

-> Yes
GO to Pinpoint Test G1034557t6.


-> No
The front seat frame is operating correctly. Submit Electronic Product Quality Report (EPQR)
with any further query.

www.