Go Back  Jaguar Forums - Jaguar Enthusiasts Forum > Jaguar Models ( Classics ) > XJ40 ( XJ81 )
Reload this Page >

No Shift Lock - Is This a Relay Module Issue?

XJ40 ( XJ81 ) 1986 - 1994

No Shift Lock - Is This a Relay Module Issue?

Old 05-08-2019, 07:25 AM
Thread Starter
Join Date: Dec 2012
Location: San Antonio Tx USA
Posts: 89
Received 7 Likes on 6 Posts
Default No Shift Lock - Is This a Relay Module Issue?

The car has no shift lock function. Even with the battery removed, the shifter can be moved to all positions. I saw on the relay diagram that there is a relay module (blue) for the key lock solenoid and the gear lock solenoid.

Is this relay module a suspect for this problem?

Also, is this relay module located under the front passenger seat?
Old 05-08-2019, 09:16 AM
Join Date: Feb 2014
Location: The Beautiful Mid-South, U.S.A.
Posts: 16,702
Received 7,761 Likes on 4,335 Posts

Hi supra-raleigh,

I believe the gear shift solenoid on the left side of the J-gate is the component involved in locking the shift lever in Park. A common problem is that the plastic parts in the J-gate that the solenoid latches to can be broken if the shift lever is forced out of Park when the solenoid is latched. Here is the schematic from pdf page 30 of the Electrical Guide, which you can download at the link below:

Jaguar XJ40 Electrical Guide 1993


Old 05-08-2019, 09:36 AM
Join Date: Dec 2009
Location: Decatur,TX
Posts: 7,934
Received 4,201 Likes on 2,739 Posts

Did the shift-lock ever work?

I replaced DOZENS of plastic selector lever housings when used car dealers bought Jaguars from 1993 onward that had theses locks. The used car lot would bring the cars in for warranty repair. Technically Jaguar should have denied the repair because it was intentional damage.

The 'lot-jockeys' at the auction yards learned how to break the housings with a quick-hard YANK to get the cars out of park when the battery died sitting for weeks.

Instead of removing the little 'star' plastic screw, they just found it easier to break the housing to get the car out of the parking space.

The following 2 users liked this post by motorcarman:
Don B (05-08-2019), Lawrence (05-08-2019)
Related Topics
Thread Starter
Last Post
S-Type / S type R Supercharged V8 ( X200 )
03-30-2017 01:46 AM
XJ6 & XJ12 Series I, II & III
12-05-2014 05:56 PM
XJ XJ6 / XJR6 ( X300 )
10-11-2011 12:21 PM
X-Type ( X400 )
02-25-2011 09:01 AM
XK8 / XKR ( X100 )
09-10-2009 10:36 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools
Search this Thread
Quick Reply: No Shift Lock - Is This a Relay Module Issue?

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: