Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Removing and installing (replacing) the control unit for the regulated rear axle differential lock (GHAS)
Attention!
Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DAMAGE (ESD PROTECTION) .
Removal:
Remove flap (1).
Unlock all connectors (1) on control unit (4) and disconnect.
Slacken both nuts (2).
Release both nuts (3) and feed the control unit (4) out of the bracket.
Installation:
Feed control unit (4) into the bracket.
Attach both nuts (3) and tighten.
Tightening torque 61 35 9AZ .
Tighten both nuts (2).
Tightening torque 61 35 9AZ .
Connect all connectors (1) to control unit (4).
Close and lock flap (1).
Replacement:
- Carry out VEHICLE PROGRAMMING/ENCODING .
- Perform start-up.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.