Tacoma Regular Cab 4WD L4-2.7L (3RZ-FE) (1999)
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Control Module HVAC: Testing and Inspection
INSPECT AMPLIFIER CIRCUIT
a. Remove the glove compartment door.
b. Disconnect the amplifier connector and inspect the connector on wire harness side, as shown in the chart.
Test conditions:
^
Turn ignition switch to ON
^
Blower speed switch HI
If the circuit is not as specified, inspect the circuits connected to other parts.
c. Connect the connector to amplifier and inspect wire harness side connector from the back side, as shown in the chart.
Test conditions
^
Running engine at idle speed
^
Blower speed switch at "HI" position
^
A/C switch ON
^
Temperature control lever at "COOL" position
^
Set on manifold gauge set
If circuit is as specified, try replacing the amplifier with a new one. If the circuit is not as specified, inspect the circuits connected to other parts.
