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:
Reassembly
REASSEMBLY
CAUTION / NOTICE / HINT
HINT:
When installing the back door outside garnish seal, heat the back door outside
garnish surface using a heat light.
Standard:
Item
Temperature
Back Door Outside Garnish
...
Precaution
PRECAUTION
1. IGNITION SWITCH EXPRESSION
(a) The type of ignition switch used on this model differs depending on the specifications
of the vehicle. The expressions listed in the table below are used in this section.
Expression
Igniti ...
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