Pinpoint Test C: 4-Way Lumbar Forward Tests

TEST CONDITIONS 

DETAILS/RESULTS/ACTIONS 

1. C1: 4-WAY LUMBAR FORWARD TEST 1 
   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
2. 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 section of the 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 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 applicable System Wiring Diagram(s) and check the lumbar forward circuit for short circuit to ground, short circuit to power, open circuit, high resistance
     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.