Pinpoint Test B: 4-Way Lumbar And Bolster Inflate 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.

B1: 4-WAY LUMBAR AND BOLSTER INFLATE TEST 1
1. Set the ignition to on
2. Operate the seat switchpack lumbar forward switch
3. Listen for the lumbar air pump operating
  Was the lumber air pump operation audible?
  
  Yes
  
  GO to B2.
  
  No
  
  GO to B3.
B2: 4-WAY LUMBAR AND BOLSTER INFLATE TEST 2
NOTE: 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 greater than specification?
  
  Yes
  
  Check the lumbar air pump hose for blockages
  
  No
  
  Check the lumbar air pump hoses for leaks
B3: 4-WAY LUMBAR AND BOLSTER INFLATE TEST 3
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 PUMP/GND -
4. Connect the multimeter across the seat switchpack lumbar pump 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 air pump circuit for short circuit to ground, short circuit to power, open circuit, high resistance