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MG ROVERGROUP

Model/Derivative:

Rover 25 / MG ZS

Rover 45 / MG ZS

Rover 75 / MG ZT

N°:

Date:

DBO015 Issue 1

12.03.2003

DRIVE bulletins update:

DRIVE is a major project within MG Rover. It's objective is to significantly improve our competitiveness.The purpose of a 'DRIVE' bulletin is to advise changes introduced as a result of the MG Rover 'DRIVE'initiative.

Detai/:

The main wiring harness on all models has been redesigned to incorporate the body harness. Theadvantages of this change not only reduces the number of block connectors used between main harnessand body harness, but also reduces facia harness to main harness connections. With the reduction in thenumber of harness connectors used, diagnostics is made easier. Coincidental with this change, the SRSharness has now been incorporated into the main harness on Rover 25/MG ZR and Rover 45/MG ZS,(Rover 75/MG ZT was already integrated and remains unchanged).

Rover 25/MG ZR. Rover 45/MG ZS & Rover 75/MG ZT - passenaer compartment fuse boxThe original passenger compartment fuse box has been replaced with a hard wired modular type fuse box.The modules are pre-assembled by the harness supplier and supplied as a child part within the harness. Allfuses are fitted to a standard configuration by the supplier but relays are custom fitted on vehicle production(track side) dependant on feature options required.

Fuse box changes include:

. Deletion of separate fuse box component from harness.

. Deletion of satellite fuse holders dependant on options.

. Deletion of fuse box harness connectors (to back and front of fuse box).

. New fuse design, changed from standard 'blade' type to 'mini' type.

. New spare fuse holder and fuse remover.

. New 'Micro' type relays replace the previous larger F4 type:Front window lift relay.

Rear window lift relay.

Alarm sounder relay.

Seat heat relay.

Daylight running lamp relay.

Rear wiper relay.

Sunroof relay.

Reverse lamp relay.

Engine crank relay.

Power wash relay.

TECHNICAL BULLETIN - OBO015 ISSUE 1@ MG Rover Group LId 2003

ENGLISH Page 1 of 4

N°: Title: Model: Introduction:

30/120/01 (RF) WIRING HARNESS - DESIGN CHANGE Rover 25/MG ZR RF 70414231 January 2003

20/090/01 (RT) Rover 45/MG ZS RT 61291817 January 2003

10/90101 (RJ) Rover 75/MG ZT RJ 27984415 January 2003

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F4 Type Micro Type

Rover 75/MG ZT - passenQer compartment fuse box additional items

. Deletion of internal diode for reverse polarity warning - the diode is now incorporated into the harness(situated within the bulk-head protector).

. Deletion of cigar lighter relay, feed is now a direct battery feed via fuse 3 (15 amp) in the passengercompartment fuse box.

. A new accessory link lead kit, part number VUBOO3120 is available to connect various accessories tothe new fuse box. The kit consists of two link leads which connect to fuse box terminals and anadditional lead with an earth eyelet (see illustration). This allows mini fuses to be added to the sparefuse positions in the passenger compartment fuse box. All three link leads have the same type ofterminal as used on current accessories therefore the current procedure of de-pinning the three way andre-pinning into single housings is carried over.

NOTE: Additional electrical kits are available for tow bar connections, refer to the Electronic PartsCatalogue (EPC) for full parts information.

VUBOO3120

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Rover25/MGZR - SIC post connectorThe rear door harness connector has been re-designed. The connection originally within the hinge face, isnow made inside the BIC post and sealed with a rubber grommet. The illustrations show the latestcondition.

TECHNICAL BULLETIN - OBO015 ISSUE 1@ MG Rover Group LId2003

ENGLISH Page 2 of 4

Rover 25/MG ZR - flasher unitF-

(.,. The flasher unit is now separate from the fuse box and re-Iocated to the 3 pronged relay mounting

bracket on the A post.

The multifunction unit (MFU) has been re-Iocated to a new bracket attached to the window lift ECUbracketlocatedforwardof the centreconsole. .

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-.I Rover 25/MGZR - brake liaht switch. A new self-adjusting brake light switch has been introduced and is fitted to a re-designed pedal box.

The harness connector is visually different.

Rover 45/MG ZS & Rover 75/MG ZT - side impact sensorsThe side impact sensor style has changed (see below), the connector colour has been changed to blue andthe sensor to orange. For Rover 45/MG ZS, the sensor location remains unchanged however for Rover75/MG ZT the sensors have been relocated to the inner sill with one connector facing forward and the otherfacing rearward (see illustration)

New side impact sensor New connector

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Rover 75/MG ZT - new location for side impact sensor

~TECHNICAL BULLETIN - OBO015 ISSUE 1@ MG Rover Group LId 2003

ENGLISH Page 3 of 4

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Rover45/MGZS & Rover75/MGZT - side impact 'Thorax' connector

The side impact 'Thorax' connector has been changed from a Tyco 'micro quadlock' connector to a moreefficient Tyco 'ELO' 2-way shorting link connector.

Rover 45/MG ZS - centrallv hiah mounted stop lamp (CHMSL) connector

The original lamp had a short link lead attached to the lamp which in turn connected to the main harness.The link lead has now been deleted and the main harness is now connected directly to the lamp.

Original stop lamp with link lead New stop lamp - with direct harnessconnection

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Rover 75/MG ZT - throttle potentiometer connector

A new throttle position sensor is fitted to a re-designed pedal box. The harness connector is visuallydifferent.

'-vRover 75/MG ZT - redundant connectors

Any redundant connectors resulting from previous component deletions have now been deleted i.e. RH hornconnector, A post Tailgate release connector etc.

-TECHNICAL BULLETIN - OBO015 ISSUE 1

@ MG Rover Group LId 2003

ENGLISH Page 4 of 4