Toyota Sienna Service Manual: How to proceed with troubleshooting
HINT: *: Use the intelligent tester.
1 VEHICLE BROUGHT TO WORKSHOP
2 CUSTOMER PROBLEM ANALYSIS
- (a) Confirm problem symptoms
3 CHECK MULTIPLEX COMMUNICATION SYSTEM*
- Check if the multiplex communication system DTC is output.
HINT: The center airbag sensor assembly of this system is connected to the multiplex communication system.
Therefore, before starting troubleshooting, make sure to check that there is no trouble in the multiplex communication system.
Result:
INSPECT MULTIPLEX
COMMUNICATION
CIRCUIT
4 CHECK CAN COMMUNICATION SYSTEM*
- Use the intelligent tester to check if the CAN communication system is functioning normally .
HINT: The ECM is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system.
Result:
INSPECT CAN COMMUNICATION
CIRCUIT
5 SRS WARNING LIGHT CHECK
- Proceed to Diagnosis System
6 CHECK FOR DTC*
- Proceed to DTC Check / Clear (5).
Result:
GO TO STEP 8
7 DIAGNOSTIC TROUBLE CODE CHART
- Proceed to Diagnostic Trouble Code Chart
GO TO STEP 10
8 SYMPTOM SIMULATION
- Proceed to Diagnosis System
9 PROBLEM SYMPTOMS TABLE
- Proceed to Problem Symptoms Table
10 CIRCUIT INSPECTION
11 IDENTIFICATION OF PROBLEM
12 REPAIR OR REPLACEMENT
13 CONFIRMATION TEST
END
System description
1. GENERAL
In conjunction with impact absorbing structure for a
frontal collision, the SRS (Supplemental Restraint
System) driver airbag and front passenger airbag
were designed to supplemen ...
Problem symptoms table
HINT:
Proceed to the troubleshooting for each circuit in the table
below.
AIRBAG SYSTEM
Symptom
Suspected Area
The SRS warning light goes off after the primary
check, ...
Other materials:
On-vehicle inspection
1. INSPECT CURTAIN SHIELD AIRBAG ASSEMBLY
(VEHICLE NOT INVOLVED IN COLLISION)
Perform a diagnostic system check.
With the curtain shield airbag assembly installed on
the vehicle, perform a visual check. If there are any
defects as mentioned below, replace the front pillar
garn ...
Heater relay (for rear air conditioning system)
ON-VEHICLE INSPECTION
1. INSPECT REAR HEATER RELAY
(a) Remove the rear heater relay.
(b) Measure the resistance according to the value(s) in
the table below.
Standard resistance
If the resistance is not as specified, replace the rear
heater relay. ...
Removal
1. REMOVE REAR WHEEL
2. REMOVE TAIL EXHAUST PIPE ASSEMBLY (See page
EX-8)
3. SEPARATE REAR SPEED SENSOR
(a) Remove the bolt and the speed sensor from the
axle carrier.
NOTICE:
Be careful not to damage the speed sensor
Prevent foreign matter from adhering to the
speed sensor.
4. REMO ...
