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
amplifier assembly and power is supplied to the quick heater assembly installed
on the radiator heate ...
IG Power Source Circuit
DESCRIPTION
The main power source is supplied to the air conditioning amplifier assembly
when the ignition switch is turned to ON. The power source is used for operating
the air conditioning ampl ...
Other materials about Toyota 4Runner:
Inspection
INSPECTION
PROCEDURE
1. INSPECT SHIFT SOLENOID VALVE SR
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
Shif ...
Security Indicator Light Assembly
Components
COMPONENTS
ILLUSTRATION
Removal
REMOVAL
PROCEDURE
1. REMOVE NO. 2 INSTRUMENT CLUSTER FINISH PANEL GARNISH
2. REMOVE SECURITY INDICATOR LIGHT ASSEMBLY
(a) Pull the security indicator light assembly to detach the 4 claws
...
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