Majestic L6-4.0L (1990)
Relay Module: Technical Service Bulletins
Blue `Hella' Relay - Diagnosis
Inoperative Blue Relay - Oxidized or Damaged Terminals - Checking/Replacement Guidelines
1988-94 MY Sedan Range
Remove and destroy Bulletin 86-178 dated 5/97.
Replace with this Bulletin.
Revisions are marked with a bar and asterisks.
The blue Hella relay (part no. DAC 7686) was used in a variety of locations and *applications on XJS and Sedan Range vehicles.*
In many cases relays have been replaced without being diagnosed properly. In other cases, the relay has been replaced with the identical relay in a
location where the use of the new sealed relay (part no. LHF 6703AA) is more suitable. This bulletin outlines what to check before replacing a relay and
where to use a sealed relay when replacing a failed blue Hella relay.
Malfunction of the relay while installed on the vehicle can be caused by:
An invisible oxide film on the relay terminals.
Loose or damaged terminals in the relay base.
On 1993-94 (4.0L) Sedan Range and XJS vehicles, the relay controlling the AIR pump clutch should be checked or replaced as outlined in bulletin
17-9 Service Action S458.
CHECKS TO PERFORM BEFORE REPLACING RELAY
Before replacing a relay, check the following:
Remove and reinstall the relay for the affected circuit. This action is often enough to clean off the oxide-film and allow the relay to operate correctly.
This is particularly the case in circuits where the relay switches a current of only a few milliamps.