Vehicles affected: P13: 570S, 570GT, 570S Spider, 540C, 600LT, 600LT Spider.

Location: Body Exterior - Closures Ancillaries

Concern:

= Alarm is going off for no reason when the car is left locked

= Unable to open door from exterior or interior door switch

Condition: Randomly occurring and /or after long parking periods > 7hours

Diagnostic Trouble Codes
SBC

B130601 Left Door Latch Internal Fault
B130701 Right Door Latch: Internal Fault

B133066 Door External Mechanical Release L: Invalid Signal Sequence

U138187 Security LIN: Left Door Latch: Missing Messages

Measure

Complaint: Alarm going off

In the event of a customer complaint that the alarm is going off randomly when the
vehicle is left locked follow the steps below:

1, Connect the MDS into the vehicle and start a diagnostic session.
2. Within SBC Sequences, run the sequence “Alarm History”.

3. If the alarm has been triggered due to “Door Opening” the root
cause of the problem is the door latch(es), Based on the alarm
history we cannot determine which door latch is causing the issue,
therefore both door lathes have to be replaced.

4, Proceed to Part Number Information section of this MTI to identify
which part number must be ordered and how to check the serial
number of the latch prior to installation

Complaint: Door not opening

If the complaint is that one or both doors do not open either permanently
or intermittently, follow the steps below:

1, Connect the MDS into the vehicle and start a diagnostic session.

2. Check for DTCs in the SBC and compare with the DTCs listed in the
Diagnostic Trouble Codes section of this MTI.

3. If any of the listed DTCs are present, proceed and replace the
affected door latch (left, right or both), based on the DTC
information,

Care Point: If one latch only has been confirmed faulty, the other door
latch must be inspected to identify the serial and part number of the
component.

Care Point: Ensure both door latches are of the same part number.

Part Numbers - Door Latch

Care Point: The part numbers below are for vehicles installed with soft
close door latches only.

LH - 11A8742CP
RH - 11A8743CP
Serial Numbers Check - Door Latch

Care Point: The serial numbers below are for vehicles installed with soft
close door latches only.

Care Point: Before fitment ensure the both door latches are outside of the
following serial numbers ranges. This check must be done on door latches
that were on your stock or received from Unipart. If a door latch is within
this range, do not install and order anew one.

The serial number of the door latch is visible on the label of the part, see
below image;

Left Hand Latch Serial Number Range

From 11100508524 to 11100508673 - Do Not Fit
From 11100508674 to 11100508723 - Do Not Fit
From 11100508724 to 11100508773 - Do Not Fit
From 11100508774 to 11100508823 - Do Not Fit
From 11100508824 to 11100508923 - Do Not Fit
From 12150102091 to 12150102240 - Do Not Fit

Right Hand Latch Serial Number Range

From 11110508547 to 11110508646 - Do Not Fit

From 11110508647 to 11110508696 - Do Not Fit

From 11110508697 to 11110508746 - Do Not Fit

From 11110508747 to 11110508796 - Do Not Fit

From 11110508797 to 11110508896 - Do Not Fit

From 12160102091 to 12160102240 - Do Not Fit

Location: Body Panels and Closures
Function Group: Closures

Sub Group: Multiple Component Replacement - Door Latch
Part: Position Sensor - Door Latch - Pair

Fault Group: Electrical

Fault Code: Inoperative

Cause: Undefined/Abuse

Rectification: Replace (R+R)

Attachments

N/A