Toyota Sienna Service Manual: Headlight Relay Circuit
DESCRIPTION
The Multiplex network body ECU controls HEAD relay when signal is received from headlight dimmer switch assembly.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 PERFORM ACTIVE TEST BY INTELLIGENT TESTER
- Connect the intelligent tester to DLC3.
- Turn the ignition switch ON and push the intelligent tester main switch ON.
- Select the item below in the ACTIVE TEST and then check that the relay operates
BODY NO. 1:
2 INSPECT HEADLIGHT RELAY
- Inspect headlight relay continuity.
Resistance
3 INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
- Measure voltage between the terminal as shown in the chart below
Voltage
REPAIR OR REPLACE HARNESS OR CONNECTOR
Ignition Switch Circuit
DESCRIPTION
The Multiplex network body ECU receives the ACC and IG signals from the
ignition switch.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 READ VALUE OF INTELLIGENT TESTER
Connect the in ...
DRL Relay Circuit
DESCRIPTION
The Multiplex network body ECU controls the DRL No.2 relay
WIRING DIAGRAM
INSPECTION PROCEDURE
1 PERFORM ACTIVE TEST BY INTELLIGENT TESTER
Connect the intelligent tester to DLC ...
Other materials:
For vehicles equipped with catalytic converter
CAUTION: If a large amount of unburned gasoline or gasoline vapors flow
into the converter, it may cause overheating and create a fire hazard. To
prevent this, observe the following precautions:
(a) Use only unleaded gasoline.
(b) Avoid idling the engine for more than 20 minutes.
(c) ...
Rear Occupant Classification Sensor RH Collision
Detection
DTC B1788 Rear Occupant Classification Sensor RH Collision
Detection
DESCRIPTION
DTC B1788 is output when the occupant classification ECU receives a collision
detection signal sent by
the rear occupant classification sensor RH if an accident occurs.
DTC B1788 is also output when the front s ...
Power Slide Door Pulse Sensor Malfunction on
Rear Left Door
DTC B2224 Power Slide Door Pulse Sensor Malfunction on
Rear Left Door
DESCRIPTION
A pulse sensor is built into slide door LH for jam and foreign
object detection and for slide door position
detection. The jam and foreign object detection feature of the pulse sensor
monitors the o ...
