XJ XJ8 / XJR ( X308 ) 1997 - 2003

Airbag warning light / intermitten

Old 01-02-2019, 01:35 PM
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Default Airbag warning light / intermitten

2003 XJ8 - Airbag warning light is coming on intermittently. I have heard that there are sensors under the front seats that can cause this...my question is....are they accessible without having to remove the seat?
Many thanks to all responders..
Old 01-02-2019, 02:07 PM
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The fastest way to know what the SRS module is faulting is to interrogate the SRS module.
We can all guess about what common faults and ways to check them but it is all a guess.

Jaguar advises that the airbags themselves are NOT to be tested directly for continuity/resistance. You might supply enough energy to ignite the airbag.
PDU, WDS or IDS should be used to read the resistance THROUGH the SRS module.

You can unplug each airbag (or harness/ circuit) and look for OPEN CIRCUIT (there is a 'shorting bar' in the connector electrically closest to the SRS module end). Then you can install a 'shunt' (a plug with a resistor) to simulate the airbag and test the circuit/harness with a multimeter.

Jaguar issued several different airbag 'testing plugs' that snap into the harness connector with the correct resistance to simulate the airbag. I made up a set with old-discarded airbag connectors soldered to 2.1 to 2.5 ohm resistors.

Good luck.

Let the guessing begin.


Last edited by motorcarman; 01-02-2019 at 06:51 PM.
Old 01-02-2019, 02:17 PM
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My airbag light was intermittent also. I discovered that one of the connectors for the airbag wiring, had come loose from the clip that secured it to the frame of the seat. Because it was not secure, connectivity was sometimes compromised when I adjusted the sear. I loosened the rear seat bolts and removed the front bolts which allowed me to tilt the seat back enough to examine the wiring and make the repair. I actually found other connections that were off the clips also.
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