On-Board Diagnostic Unit (DCU) (Range Rover 3)

Contents: Dismantling ⇩ Assembly ⇩

If it is necessary to replace the electronic control unit, then before disconnecting the battery, it is necessary to connect the Testbook / T4 and perform the recommended actions.

Before disconnecting the battery, make sure that all requirements and conditions contained in the section on disconnecting the battery are met.

GENERAL INFORMATION, Precautions when working with electrical equipment.

WARNING: Before carrying out work on passive safety systems, it is necessary to carefully read the relevant technical documentation.

WARNING: Always remove both battery terminals before operating Passive Safety systems (SRS). First disconnect the "negative" terminal. Never mix up the wires when connecting to the battery pack.

CAUTION: The on-board diagnostic unit of the passive safety systems must be replaced after each collision.

Dismantling

1. Follow all safety rules when working with passive safety systems.

GENERAL INFORMATION, Safety precautions when working with the airbag system (SRS).

2. Remove the center console.

CAR INTERIOR PARTS, REPAIR WORK, Center console.

3. Remove the air suspension control panel.

CAR INTERIOR PARTS, REPAIR WORK, Switch panel - air suspension.

4. Disconnect the connector from the heater fan motor.

5. Remove the 2 screws securing the heater motor to the bracket.

6. Loosen and remove the heater motor.

7. Remove the retainer securing the center console heater duct to the heater-fan-air conditioner (HEVAC) unit and remove the heater duct.

8. Remove the 4 screws securing the center console heater motor bracket to the floor transmission tunnel.

9. Remove the center console heater motor bracket.

10. Loosen and remove the cover from the diagnostic unit (DCU).

11. Disconnect the connector block from the diagnostic unit.

12. Unscrew the nut securing the ground wire to the diagnostic unit. Remove the ground wire.

13. Remove the 2 screws securing the diagnostic unit to the transmission tunnel. Remove the diagnostic unit.

CAUTION: The diagnostic unit of the passive restraint systems is sensitive to impacts and should therefore be handled with care.

Assembly

1. Install the diagnostic unit on the transmission tunnel, connect the ground wire, screw on the nuts and tighten them to a torque of 10 Nm.

NOTE: If a component of the passive restraint system needs to be replaced, the bar code of the new component must be recorded.

2. Connect the connector to the diagnostic unit connector.

3. Install and secure the cover of the diagnostic unit.

4. Install the heater motor bracket onto the transmission tunnel, tighten the screws and torque to 25 Nm.

5. Install the center console heater duct to the HEVAC unit and secure it with the clips.

6. Install the heater motor on the bracket and secure it with screws.

7. Connect the connector to the heater motor.

8. Reinstall the air suspension control panel.