Toyota RAV4 manuals

Toyota Sienna Service Manual: Back-up Power Source Circuit

DESCRIPTION

This is the back-up power source for the A/C amplifier. Power is supplied even when the ignition switch is off and is used for diagnostic trouble code memory, etc.

WIRING DIAGRAM

Back-up Power Source Circuit

INSPECTION PROCEDURE

1 INSPECT FUSE (ECU-B)

(a) Remove the ECU-B fuse from the engine room junction block.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance

2 CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)

CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)

(a) Disconnect the connector from the A/C amplifier.

(b) Measure the voltage according to the value(s) in the table below.

Standard voltage

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

ACC Power Source Circuit
DESCRIPTION This circuit supplies power to the A/C amplifier and the illumination for the clock. WIRING DIAGRAM INSPECTION PROCEDURE 1 INSPECT FUSE (ECU ACC) (a) Remove the ECU ACC fuse fr ...

Air conditioning system (for manual air conditioning system)
...

Other materials:

Disassembly
1. REMOVE FRONT DISC BRAKE BUSH DUST BOOT (a) Using soft jaws on the vise, hold the front disc brake cylinder mounting LH in the vise through aluminum plates. (b) Using a screwdriver and hammer, remove the 2 front disc brake bush dust boots from the front disc brake cylinder mounting LH. ...

How to proceed with troubleshooting
HINT: Troubleshoot in accordance with the procedures on the following pages 1 VEHICLE BROUGHT TO WORKSHOP 2 CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK 3 INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE MULTIPLEX COMMUNICATION SYSTEM (BEAN) Use the intelligent tester to check for normal ...

How to proceed with troubleshooting
1 VEHICLE BROUGHT TO WORKSHOP 2 CUSTOMER PROBLEM ANALYSIS Interview the customer and confirm the trouble. Confirm the problem by duplicating the conditions described by the customer 3 BASIC INSPECTION Basic inspection. Measure the battery voltage. Standard voltage: 11 ...

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