Removal and installation of mounting blocks (Mercedes-Benz M-Class W163)

1. The main mounting block is located on the left side of the engine compartment and consists of two separate sections: the fuse/relay section and the control module section. The installation details of the main mounting block are shown in the illustrations to which all references in the text refer.

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2. Open the hood and fix it in a vertical position.

3. Disconnect the negative cable from the battery.

4. Release the clamps and remove the fuse compartment cover (1), - check the condition of the sealing gasket, replace it if necessary.

5. Loosen the fastening screws (3) and remove the control module section cover (2) - replace the gasket if necessary.



6. Remove the screws (4) and lift up to release the fuse/relay holder (5).

7. After releasing the clamps and unscrewing the fastening screws, disconnect the electrical wiring connectors and finally remove the holder - the holder connectors have an asymmetrical design, which determines the uniqueness of their connection.

8. Remove the fuel injection system (ME-SFI) and traction control system (ETS/ESP) control modules (see Section Removal and installation control modules).

9. Remove the screws (6).

10. Disconnect the electrical wiring from the electric motor (M2/2) of the control module section blower fan.

11. Release the wiring harness assembly with its support bracket from the fuse and relay module (F1) and move it behind the mounting block.

12. Remove the cover on the left under the instrument panel, disconnect the hood latch release cable assembly (13) from its lever and release it from the mounting block.

13. Remove the fastening nuts (8).

14. Disconnect the connectors of the electrical wiring that passes through the fuse/relay module and is not connected to the junction block inside the latter.

15. Pull back the wiring harness and release the windshield washer fluid supply hoses from the support brackets on the mounting block.

16. Remove the washer fluid reservoir (see Chapter Body).

17. Remove the main mounting block.

18. Installation is carried out in reverse order.

Removal and installation the interior fuse and relay box

1. The details of installing the cabin mounting block in the passenger footwell are shown in the illustration, to which all references in the text refer.

2. Remove the cover on the right under the instrument panel and the side trim panel of the passenger footwell (see Chapter Body).

3. Disconnect the 30 (1) and 15R (2) circuit cables from the fuse/relay mounting block (F2) in the footwell.

4. Remove the cable ties (4) - try not to damage the electrical wiring harnesses.

5. Disconnect and remove the contact connector (5) from pillar A - loosen the fastening nut on the rear side of the connector and push the latter forward.

6. Disconnect the contact connector (6).

7. Loosen the nut securing the ground busbar (W29/2) to pillar A and disconnect the cable (3) of circuit 31 from the ground.

8. Loosen the plastic nuts (7) and remove the interior fuse and relay box (F2) from the right front leather well.

9. Installation is carried out in the reverse order - make sure that the electrical wiring is properly calcined.