Pinpoint Test E: 4-Way Lumbar Up Tests

TEST CONDITIONS 

DETAILS/RESULTS/ACTIONS 

1. E1: 4-WAY LUMBAR UP TEST 1 
   NOTE:

   • Circuit reference - VBATT -
   • The 4-way lumbar up 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 up switch

   Is the measured current less than specification?

   • Yes  : GO to E2.
   • No  : Check the lumbar/bolster pump hose and the lumbar air cell hoses for blockages/leaks
2. E2: 4-WAY LUMBAR UP 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 - VBATT -
   4. Connect the multimeter across the seat switchpack lumbar up terminal and the ground terminal
   5. Set the ignition to on
   6. Operate the seat switchpack lumbar up 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 up circuit for short circuit to ground, short circuit to power, open circuit, high resistance
     NOTE:

     • When the seat switchpack lumbar down switch is operated, the lumbar upper deflate solenoid and the lower inflate solenoids are energised.
     • The battery support unit must be connected during this test to ensure that the power supply is stable.