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Home >> Land Rover >> 2022 >> Range Rover Sport HST >> Repair and Diagnosis >> Body & Frame >> Seats >> Seating -- Range Rover Sport/L494 >> Seating >> Diagnosis And Testing >> Seats - Vehicles With: Lumbar/Massage (G1817477) >> Pinpoint Tests >> Pinpoint Test F: 4-Way Lumbar Rearward Tests

Pinpoint Test F: 4-Way Lumbar Rearward Tests

  1. F1: LUMBAR REARWARD TEST 1 
    NOTE:
    • When the seat switchpack lumbar rearward switch is operated, the lumbar upper and lower deflate solenoids are energised.
    • The battery support unit must be connected during this test to ensure that the power supply is stable.
    NOTE:
    • Circuit reference - VBATT -
    • The 4-way lumbar rearward circuit current specification is 1.00A ± 10%.
    1. Connect an inductive ammeter to the seat switchpack power circuit
    2. Set the ignition to on
    3. Operate the seat switchpack lumbar rearward switch

      Is the measured current less than specification?

      Yes:  GO to  F2.

      No:  Check the lumbar air cell hoses for blockages

  2. F2: 4-WAY LUMBAR REARWARD TEST 2 
    NOTE: Do not disconnect the electrical connector during this step; the seat switchpack is removed for access to the wiring harness only.
    1. Refer to the relevant service information and remove the seat switchpack
    2. Set a multimeter to measure voltage
    3. Using the multimeter, measure and record the battery voltage (reference voltage)
      NOTE: Circuit reference - LUMBAR RWD/GND -
    4. Connect the multimeter across the seat switchpack lumbar rearward terminal and the ground terminal
    5. Set the ignition to on
    6. Operate the seat switchpack lumbar rearward switch

      Is the measured voltage less than battery voltage?

      Yes:  GO to PINPOINT TEST A .

      No:  Refer to the electrical circuit diagrams and check the lumbar rearward circuit for short circuit to ground, short circuit to power, open circuit, high resistance

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