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Control Units and Relays Land Rover Range Rover III

Accessories Control Systems 6 illustrations ~338 words

86.55.07 Electronic control unit (ECU) - trailer

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. Refer to ELECTRICAL PRECAUTIONS

Scheme 1

Scheme 1: Remove
Scheme 1: Remove
  1. Disconnect battery earth lead.
  2. Remove access panel from load space RH trim casing.
  3. Remove 2 nuts securing trailer ECU.
  4. Release and disconnect multiplug.
  5. Remove trailer ECU.

Refit

  1. Position trailer ECU and connect multiplug.
  2. Fit trailer ECU and secure with nuts.
  3. Fit access panel.
  4. Connect the battery earth lead.
  5. Configure new ECU using TestBook/T4

Scheme 2

Scheme 2: Remove
Scheme 2: Remove
  1. Remove glove box. See «76.52.03 GLOVE BOX»(/land-rover/range-rover/iii-2002-2005/remont/exteriorinterior-trim/#interior-fittings)
  2. Remove horn relay.
  1. Fit horn relay.
  2. Fit glove box. See «76.52.03 GLOVE BOX»(/land-rover/range-rover/iii-2002-2005/remont/exteriorinterior-trim/#interior-fittings)

Scheme 3

Scheme 3: Remove
Scheme 3: Remove
  1. Remove passenger side end closing panel from fascia. See «76.46.11 CLOSING PANEL -- FASCIA END»(/land-rover/range-rover/iii-2002-2005/remont/exteriorinterior-trim/#interior-fittings)
  2. Rotate relay holder anti-clockwise to release for access.
  3. Remove heated front screen relay from holder.
  1. Fit and secure heated front screen relay to holder.
  2. Fit closing panel. See «76.46.11 CLOSING PANEL -- FASCIA END»(/land-rover/range-rover/iii-2002-2005/remont/exteriorinterior-trim/#interior-fittings)
  3. Fit end closing panel to fascia. See «76.46.11 CLOSING PANEL -- FASCIA END»(/land-rover/range-rover/iii-2002-2005/remont/exteriorinterior-trim/#interior-fittings)

Scheme 4

Scheme 4: Remove
Scheme 4: Remove
  1. Remove access panel from load space RH trim casing.
  2. Identify and remove relay.
  1. Fit relay.
  2. Fit access panel.

86.55.75 Body Control Unit (BCU)

If the BCU 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. Refer to ELECTRICAL PRECAUTIONS

Scheme 5

Scheme 5: Remove
Scheme 5: Remove

Scheme 6

Scheme 6
Scheme 6
  1. Make the SRS system safe. See «SUPPLEMENTARY RESTRAINT SYSTEM (SRS) PRECAUTIONS»(/land-rover/range-rover/iii-2002-2005/remont/oem-general-information/#general-information__supplementary-restraint-system-srs-precautions)
  2. Remove front passenger seat. See «FRONT SEAT»(/land-rover/range-rover/iii-2002-2005/remont/seats/#seats)
  3. Release 2 turnbuckles securing cover and remove cover.
  4. Release and disconnect 3 multiplugs from BCU.
  5. Remove BCU.
  1. Fit BCU and connect multiplugs.
  2. Fit cover and secure with turnbuckles.
  3. Fit front seat. See «FRONT SEAT»(/land-rover/range-rover/iii-2002-2005/remont/seats/#seats)
  4. Configure new BCU using TestBook/T4.

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