Toyota Sienna Service Manual: How to proceed with troubleshooting
1 VEHICLE BROUGHT INTO A WORKSHOP
2 DIAGNOSTIC QUESTIONING AND SYMPTOM CONFIRMATION
- Ask the customer about symptoms and confirm malfunctions.
3 CONFIRM THE SYSTEM NORMAL CONDITION
4 CHECK DTC
HINT: If the system cannot enter the diagnosis mode, inspect each AVC-LAN communication signal and repair or replace problem parts.
5 DTC CLEAR
- Clear the DTCs and finish the diagnostic mode.
HINT: The currently output DTCs may not indicate actual malfunctions depending on the vehicle conditions.
6 RECHECK DTC
HINT:
- If the system cannot enter the diagnosis mode, inspect the AVC-LAN and all the components that connect to the AVCLAN for short circuits.
- Even if the malfunction symptom is not confirmed, check for diagnostic trouble codes. This is because the system stores past diagnostic trouble codes.
- Refer to the detailed description on the diagnostic screen, as necessary.
- Check the diagnostic trouble code and inspect the area the code indicates.
7 DIAGNOSTIC TROUBLE CODE CHART
- Find the output code on the diagnostic trouble code chart.
8 PROBLEM SYMPTOMS TABLE
- Find the applicable symptom code in the problem symptoms table.
HINT: If the symptom does not recur and no code is output, perform the symptom reproduction method
9 CHECK THE ECU TERMINAL ARRANGEMENT BASED ON THE MALFUNCTION SYMPTOM
10 CHECK THE CIRCUIT
- Adjust, repair, or replace as necessary.
11 RECHECK THE DIAGNOSTIC TROUBLE CODE
HINT: After deleting the DTCs, recheck for diagnostic trouble codes.
12 PERFORM CONFIRMATION TEST
END
System description
1. Radio and navigation assembly outline
Conventionally, 2 separate devices, a "radio and
display" and a "navigation ECU" are used. This
model has adopted a new type, ...
Identification of noise source
1. Radio Description
Radio frequency band
Radio broadcasts use the radio frequency bands
shown in the table below
Service area
The service areas of AM and FM broa ...
Other materials:
Driving position memory
Your preferred driving position (the position of the driver’s seat and
outside rear view mirrors) can be recalled by pressing a button.
Two different driving positions can be recorded into memory.
Recording procedure
Check that the shift lever is in P.
Turn the engine switch to IGNI ...
Removal
1. REMOVE OUTSIDE MOULDING
Put protective tape around the outside moulding.
Using a heat light, heat the moulding between 40 to
60 C (104 to 140 F).
NOTICE:
Do not heat the moulding excessively.
Tie both piano wire ends to a wooden block or a
similar object.
Cut off the tape by ...
Terminals of ecu
1. A/C AMPLIFIER
(a) Waveform 1:
(b) Waveform 2:
(c) Waveform 3: ...
