Restraints and Safety Systems: Service and Repair

Diagnostic Control Unit (DCU)

Service Repair No - 76.74.68

If the ECU is to be replaced then Testbook/T4 must be connected and correct procedures adhered to, prior to battery disconnection.

Before disconnecting the battery, ensure all text and cautions in the battery disconnection section are observed.

WARNING:
^ It is imperative that before any work is undertaken on the SRS system, the appropriate information is read thoroughly.
^ Always disconnect both battery leads before beginning work on the SRS system. Disconnect the negative lead first. Never reverse connect the battery.

CAUTION: The SRS DCU must be replaced after every deployment has occurred.

Remove
1. Make the SRS system safe.
2. Remove centre console.
3. Remove air suspension switch panel.





4. Disconnect multiplug from heater motor.
5. Remove 2 screws securing heater motor to mounting bracket.
6. Release and remove heater motor.





7. Remove clip securing centre console heater duct to HEVAC assembly and remove the heater duct.





8. Remove 4 bolts securing centre console heater motor retaining bracket to transmission tunnel.
9. Remove centre console heater motor retaining bracket.





10. Release and remove DCU cover from DCU.





11. Disconnect multiplug from DCU.
12. Remove nut securing earth lead to DCU. Remove earth lead.
13. Remove 2 nuts securing DCU to transmission tunnel. Remove DCU.

CAUTION: The SRS DCU is a shock sensitive device and must be handled with care.

Refit
1. Position DCU to transmission tunnel, fit earth lead, fit nuts and tighten to 10 Nm (7 lbf.ft).

NOTE: If the SRS component is to be replaced, the bar code of the new unit must be recorded.

2. Connect multiplug to DCU.
3. Fit and secure DCU cover to DCU.
4. Position centre console heater motor retaining bracket to transmission tunnel, fit bolts and tighten to 25 Nm (18 lbf.ft).
5. Fit centre console heater duct to HEVAC assembly and secure with clip.
6. Fit heater motor to mounting bracket and secure with screws.
7. Connect multiplug to heater motor.
8. Fit air suspension switch panel.
9. Fit centre console.
10. Connect battery leads, earth lead last.
11. Initiate using TestBook/T4.