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Steering Angle Sensor Replacement
 
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Pelican Technical Article:

Steering Angle Sensor Replacement

Steve Vernon

Time:

4 hours4 hrs

Tab:

$100

Talent:

**

Tools:

T-27 Torx, 10mm Hex with a breaker bar, Phillips screwdriver

Applicable Models:

Mercedes-Benz W124 (1986-95)

Parts Required:

Steering angle sensor

Hot Tip:

Have someone hold the wheel when loosing main bolt

Performance Gain:

Working electronics

Complementary Modification:

Install a new steering wheel

The steering angle sensor is located behind the steering wheel on the steering shaft. To remove it you first need to remove the steering wheel. Make sure when removing the sensor you take it off as one piece. If it separates the internal wiring is a pain to get back in place properly.

Locate the negative terminal on the battery (yellow arrow) and remove the negative ground cable (red arrow) Place the cable in a manner that it cannot come in contact with the battery while working.
Figure 1

Locate the negative terminal on the battery (yellow arrow) and remove the negative ground cable (red arrow) Place the cable in a manner that it cannot come in contact with the battery while working. Allow the car to sit for at least 15 minutes before working further on it to allow any remaining electrical energy in the car to dissipate.

The steering wheel has an air bag that will need to be removed before the wheel can come off (red arrow).
Figure 2

The steering wheel has an air bag that will need to be removed before the wheel can come off (red arrow).

Use a T-27 and loosen both screws that hold the airbag unit on (red arrow).
Figure 3

Use a T-27 and loosen both screws that hold the airbag unit on (red arrow). The screws are on each side of the back of the wheel at 3 and 9 o'clock. If the handle on your Torx driver is too long, try turning the wheel or even removing the lower dash cover to give you more room.

In this photo you can see the T27 wrench that I removed from the holder to make it easier (red arrow).
Figure 4

In this photo you can see the T27 wrench that I removed from the holder to make it easier (red arrow). With both screws loosened you can pull the airbag forward away from the wheel (yellow arrow). Note: the key is in the ignition so the steering wheel can be turned but the battery has been disconnected for at least 15 minutes before we started working on the airbag (green arrow).

Pull the airbag unit from the wheel and disconnect the plug (red arrows).
Figure 5

Pull the airbag unit from the wheel and disconnect the plug (red arrows). Always store the airbag unit with the logo or padded side facing up. The two screws that hold the bag to the wheel will remain in the wheel (yellow arrow, one shown).

The wiring connection for the horn and airbag does not disconnect from this point (yellow arrow).
Figure 6

The wiring connection for the horn and airbag does not disconnect from this point (yellow arrow). You will need to remove the wheel, ring and lower dash. Disconnect the two horn wires (red arrows).

Use a 10mm Allen socket along with a breaker bar to loosen the single screw holding the wheel to the shaft (red arrow).
Figure 7

Use a 10mm Allen socket along with a breaker bar to loosen the single screw holding the wheel to the shaft (red arrow). Do NOT use the steering lock to help break the nut loose. Make sure to have someone hold the steering wheel stationary while breaking the bolt free.

There are witness marks on both the steering wheel (red arrows) and the shaft (yellow arrows) to make sure everything lines up when reassembling.
Figure 8

There are witness marks on both the steering wheel (red arrows) and the shaft (yellow arrows) to make sure everything lines up when reassembling. If yours are faded make your own marks with some white out or nail polish.

Pull the wheel straight back and off the shaft.
Figure 9

Pull the wheel straight back and off the shaft. The steering angle sensor will remain on the shaft.

To remove the steering angle sensor use a Philips head screwdriver and remove the two small screws (red arrows).
Figure 10

To remove the steering angle sensor use a Philips head screwdriver and remove the two small screws (red arrows). Use caution when pulling it off the steering shaft to remove it as one piece. If you separate the two plates the wiring will spool out and it is not easy to get it back in.

You have to follow the wiring harness back down through the steering column cover to disconnect it (red arrow).
Figure 11

You have to follow the wiring harness back down through the steering column cover to disconnect it (red arrow).

The wiring connects up under the dash.
Figure 12

The wiring connects up under the dash. You will need to remove the lower dash (red arrow) to get access to the connections. Please see our article on lower dash removal for further assistance.

Remove the three Philips head screws holding the switches to the shaft (red arrows).
Figure 13

Remove the three Philips head screws holding the switches to the shaft (red arrows). This will give you more room to work around the wiring.

The wiring connections for the steering angle sensor (red arrow) are up under the engine control unit (yellow arrow).
Figure 14

The wiring connections for the steering angle sensor (red arrow) are up under the engine control unit (yellow arrow). You can remove the engine control unit by turning the release knob on it and pulling it out to give you more room to work.

This photo illustrates the two wiring connections for the sensor (red arrow) with the control unit removed.
Figure 15

This photo illustrates the two wiring connections for the sensor (red arrow) with the control unit removed. Disconnect the wiring.

Feed the wiring up through the steering column cover and pull them out through the end.
Figure 16

Feed the wiring up through the steering column cover and pull them out through the end. Installation is the reverse of removal.

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