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

TEST CONDITIONS 

DETAILS/RESULTS/ACTIONS 

1. 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.
2. B2: 4-WAY LUMBAR AND BOLSTER INFLATE TEST 2 
   NOTE: 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 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.
3. 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 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 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 applicable System Wiring Diagram(s) and check the lumbar air pump circuit for short circuit to ground, short circuit to power, open circuit, high resistance
   NOTE:

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