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
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)
(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 ...
Other materials:
Repair
1. REPAIR REAR WINDOW DEFOGGER WIRE
Clean the broken wire tips with grease, wax and
silicone remover.
Place the masking tape along the both sides of the
wire.
Thoroughly mix the repair agent (Dupont paste No.
4817).
Using a fine tip brush, apply a smal ...
Customer problem analysis
HINT:
In troubleshooting, confirm that the problem symptoms
have been accurately identified. Preconceptions should be
discarded in order to make an accurate judgment. To
clearly understand what the problem symptoms are, it is
extremely important to ask the customer about the
problem an ...
Removal
1. Remove engine under cover no.1
2. Disconnect cable from negative battery
terminal
3. Drain automatic transaxle fluid (see page
ax-131)
4. Remove automatic transaxle oil pan subassembly
(a) Remove the 18 bolts, oil pan and gasket.
NOTICE:
Some fluid will remain in the oil pan. ...
