Toyota 4Runner: Back-up Power Source Circuit
DESCRIPTION
The back-up power source circuit for the air conditioning amplifier assembly is shown below. Power is supplied even after the ignition switch is turned off and is used for diagnostic trouble code memory, etc.
WIRING DIAGRAM
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CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY) |
|
(a) Disconnect the F42 amplifier connector. |
|
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(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F42-21 (B) - Body ground |
Always |
11 to 14 V |
|
*a |
Rear view of wire harness connector (to Air Conditioning Amplifier Assembly) |
| OK | .gif) |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
PTC Heater Circuit
DESCRIPTION
PTC heater relays are closed in accordance with signals from the air conditioning
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IG Power Source Circuit
DESCRIPTION
The main power source is supplied to the air conditioning amplifier assembly
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Tire Pressure Warning Light Circuit
DESCRIPTION
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Terminals Of Ecu
TERMINALS OF ECU
1. TERMINALS OF ECU
Text in Illustration
*a
Component without harness connected
(Skid Control ECU)
-
-
Terminal No. (Symbol)
Terminal Description
...
0.0125