Pinpoint Test C: 4-Way Lumbar Forward Tests

WARNING: This page is about a different car, the 2020 Jaguar XE and 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.

C1: 4-WAY LUMBAR FORWARD TEST 1
NOTE:
- When the seat switchpack lumbar forward switch is operated, the lumbar upper and lower inflate solenoids are energized.
- The battery support unit must be connected during this test to make sure that the power supply is stable.
NOTE:
- Circuit reference - VBATT -
- The 4-way lumbar forward circuit current specification is 1.55A ± 10%.
1. Connect an inductive ammeter to the seat switchpack power circuit
2. Set the ignition to on
3. Operate the seat switchpack lumbar forward switch
  Is the measured current less than specification?
  
  Yes
  
  GO to C2.
  
  No
  
  Check the lumbar/bolster pump hose and the lumbar air cell hoses for blockages/leaks
C2: 4-WAY LUMBAR FORWARD 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 article of the repair 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 FWD/GND -
4. Connect the multimeter across the seat switchpack lumbar forward terminal and the ground terminal
5. Set the ignition to on
6. Operate the seat switchpack lumbar forward 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 forward circuit for short circuit to ground, short circuit to power, open circuit, high resistance