I’ve just had the AA out and confirmed all 4 heater plugs not working , so more than likely the control relay unit , has anyone ever changed one ? And where is its exact location please .
Rob Dale
A word of warning, from the manual -
"The system is a low-voltage glow system. At 7 volts, the nominal voltage of the sheathed-element glow plugs is significantly
lower than the 12 volts of the main electrical circuit."
This means that if you try to operate them directly from the battery, then there is a good chance that they will be damaged.
The unit has it's own 12V and 0V supply and takes its commands from the ECU, if there is a faulty glow plug it should tell you which ones.
![Image]()
No idea where it is fitted, but this should give you some idea of what you are looking for
"The system is a low-voltage glow system. At 7 volts, the nominal voltage of the sheathed-element glow plugs is significantly
lower than the 12 volts of the main electrical circuit."
This means that if you try to operate them directly from the battery, then there is a good chance that they will be damaged.
The unit has it's own 12V and 0V supply and takes its commands from the ECU, if there is a faulty glow plug it should tell you which ones.
No idea where it is fitted, but this should give you some idea of what you are looking for
Having fun with this one.
From the wiring diagrams there are two fuses -
Sheet 1 bottom left is a 60A fuse 4EA this goes to a green / Red wire (GN-RD) and is the main power.
Sheet 1 about 1/3rd the way down on the right is a 15A fuse 8EA that goes to a grey and yellow cable (GY-YE), this is the control fuse, it splits into two on sheet 1 and again on sheet 2.
From sheet 2 the 60A fuse is the power to the module, the 15A fuse is the control, but it also goes to Sensor-heated-oxygen-front and to Pump-supercharge-coolant any one of these three can blow the control fuse and disable the glow plug module.
Time to get out the multimeter and diagnostics - just replacing stuff is an expensive way of fault finding, especially at LR parts prices.
![Image]()
![Image]()
From the wiring diagrams there are two fuses -
Sheet 1 bottom left is a 60A fuse 4EA this goes to a green / Red wire (GN-RD) and is the main power.
Sheet 1 about 1/3rd the way down on the right is a 15A fuse 8EA that goes to a grey and yellow cable (GY-YE), this is the control fuse, it splits into two on sheet 1 and again on sheet 2.
From sheet 2 the 60A fuse is the power to the module, the 15A fuse is the control, but it also goes to Sensor-heated-oxygen-front and to Pump-supercharge-coolant any one of these three can blow the control fuse and disable the glow plug module.
Time to get out the multimeter and diagnostics - just replacing stuff is an expensive way of fault finding, especially at LR parts prices.
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
