P1807-00 (2F) Four-wheel drive high ratio - short circuit to ground

[hydronaut]

Hopefully somebody can point me in the right direction. Literally down to 3 codes now. Driver seat heater, cruise control, and this.

I looked at the wiring diagram and tested pin 20 on the switch which reads 12 volts (14+ when running). Not sure what other leads I should be testing.

I have read some other posts where it ended up being the switch. Is there a process to test this outside of switching it with another?

Any help appreciated.

 

[discostew]

What codes?

 

[hydronaut]

What codes?

P0576-16 - Speed control input - circuit low

Cruise does not work

P1807-00 - Four-wheel drive high ratio - short circuit to ground

4-Lo does not work

B1A73-18 - Left seat heater

This shows up after pushing the left heated seat button. All other heated seats work.

 

[discostew]

assuming your working on a LR3.
The code P1807-00 is bitching about the 4 wheel drive high indicator circuit. Land Rovers service info is saying to check the LED circuits and also calls out an internal switch failure for the LED circuit internal to that switch. probably not causing it not to shift.

 

[discostew]

As far as the P0576-16 you’re going to have to tell me what module it’s stored in. Or maybe what vehicle your working on

 

[hydronaut]

assuming your working on a LR3.
The code P1807-00 is bitching about the 4 wheel drive high indicator circuit. Land Rovers service info is saying to check the LED circuits and also calls out an internal switch failure for the LED circuit internal to that switch. probably not causing it not to shift.

Thanks. Yes 2005 LR3 HSE. Going to try swapping the switch as some trim piece clips broken planned on replacing and got one cheap.

Does it say what connector to check at. I am looking at the wiring diagrams but does not show connector pinout, description of wired etc. is there anywhere this info is available?

Appreciate the help

 

[hydronaut]

As far as the P0576-16 you’re going to have to tell me what module it’s stored in. Or maybe what vehicle your working on

2005 LR3. Powertrain control module.

 

[discostew]

Land Rover’s service info is saying check the circuit between the switch and the ECM. So if you’re saying that’s the switch you checked for battery voltage make sure that battery voltage gets pulled low when you press the switch. Either that or it’s not supposed to be at 12 volts. Cause they also say switch possibly stuck.

 

[hydronaut]

Land Rover’s service info is saying check the circuit between the switch and the ECM. So if you’re saying that’s the switch you checked for battery voltage make sure that battery voltage gets pulled low when you press the switch. Either that or it’s not supposed to be at 12 volts. Cause they also say switch possibly stuck.

Traced it to the switch, internal short. 4-Lo working great.

Any chance you can look up any troublehooting tips for the below?

0576-16 - Speed control input - circuit low. Maybe I will get lucky and it will be the switch too.