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[amba]

Whilst messing about earlier today though I would have a look at the annoying error code I get on ignition switch on of "Headlight Level error"

Code reader shows 3.4 volts to rear sensor but 0 volts present at front ..3.0 volts at both headlight level motors.

Does this seem to point conclusively to faulty level sensor on wishbone or wiring to sensor

[Kevin Wood]

Mine has started playing up, too. I think it's the rear sensor, and probably because I drowned it.

I can take a look on the Tech 2 for comparative voltages later, but 0v is never going to be correct. (assuming car was on its' wheels on level ground)

I wouldn't rule out a wiring problem either. I've heard tell that the wiring to the ECU under the driver's side wheel arch liner can chafe and cause some issues.

Can you read the codes from the ECU?

[amba]

Hi Kevin.

This is what it has put up:

B3410   (0)  Front car level sensor,signal low input - present
b1424   (0)  Power supply.low input present

[minifreek]

It could be something as simple as the arm has popped off the sensor on the wishbone...

[Kevin Wood]

Yep, looks like it's the front sensor that's giving it issues.

[amba]

Arm is on both ends and motor feels slight resistance when arm is moved manually.

Will get the sensor swapped over and see if that solvse problem as error message is getting really annoying

Assume current flows to sensor then back to lamp motors for adjustment....as with lights on /ignition off/then ignition on can see a slight movement from the light height which seems to indicate motors are moving.

[Kevin Wood]

Diagnostic procedure states you can measure some voltages at the sensor connector.

Should have:

Less than 0.3V between pin 3 and ground.
Less than 0.3V between pin 1 and ground.
5V between pin 2 and ground.

As you look into the connector with the retaining clip uppermost, Pin 1 is on your left, pin 2 central, pin 3 right.

If you connect pin 1 to pin 2, you should see about 5V in the live data, and pin 1 to pin 3 should give you 0V. If that all works, it's most likely a duff sensor.

[amba]

Thanks for very helpfull diagnostic checks,Kevin.

Back sensor is showing 3.4 volts on live data but front has 0 so will carry out full investigation when rain stops ( around mid June  ) and go from there

Cheers for great help

[TheBoy]

amba - worth measuring with meter, based on Kevin Wood's post, as obviously the diagnostics machine only shows what the levelling ECU thinks it can see

[amba]

All now fixed and error message cured.

Fault traced to a damaged wire going to the plug for the sensor. Seems the wires corrode and perish as exposed to elements..why didn,t GM fit a rubber cover or cap onto the plug.

Replacement plug soldered on and all heatshrunk so sound now   .As an extra further precaution I have covered the  exposed end of plug with silicone sealant to try and protect it from future cable perishing.

Thanks for help guys