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Volume 1

Diagnostic Manual, Body and Accessories,
Volume 1.1

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LOCATION:

3.5 Models 129, 140, 170 > Pneumatic System Equipment (PSE) > 11 Diagnosis - Function Test (Retractable Rear Head Restraint)

Diagnosis - Function Test (Retractable Rear Head Restraint)

Preparation for Test:
1. Retractable rear head restraints extended up.
2. Ignition: ON
3. Battery voltage 11 - 14 V.
4. Check fuses ok.
5. Voltage to control modules and CAN data lines ok.

Test step/Test scope Test condition Nominal value Possible cause/Remedy 1)

1.0 Retract rear head restraints. Press RHR unlocking switch (S52). Both retractable rear head restraints retract. Retractable rear head restraints do not retract and pump motor in PSE control module (A37) does not run.
PSE version coding incorrect,
PSE (A37).

Retractable rear head restraints do not retract even though pump motor in PSE control module (A37) runs.
Mechanical fault in RHR,
23 PSE/RHR 1.0,
32 PSE/RHR 1.0,
33 PSE 10.0

1) Observe Preparation for Test, see 22.