Toyota RAV4 manuals

Toyota Sienna Service Manual: Identification of noise source

1. Radio Description

  1.  Radio frequency band
  1.  Radio broadcasts use the radio frequency bands shown in the table below.

Radio Description

  1. Service area

Radio Description

  1.  The service areas of AM and FM broadcasts are vastly different. Sometimes an AM broadcast can be received very clearly but an FM stereo cannot. FM stereo has the smallest service area, and is prone to pick up static and other types of interference such as noise.
  1.  Radio reception problems

HINT: In addition to static, other problems such as "phasing", "multipath", and "fade out" exist. These problems are not caused by electrical noise, but by the radio signal propagation method itself.

Radio Description

  1. Phasing
    AM broadcasts are susceptible to electrical interference and another kind of interference called phasing. Occurring only at night, phasing is the interference created when a vehicle receives 2 radio wave signals from the same transmitter. One signal is reflected off the ionosphere and the other signal is received directly from the transmitter

Radio Description

  1. Multipath
    Multipath is a type of interference created when a vehicle receives 2 radio wave signals from the same transmitter. One signal is reflected off buildings or mountains and the other signal is received directly from the transmitter.

Radio Description

  1. Fade out
    Fade out is caused by objects (buildings, mountains, and other such large obstacles) that deflect away part of a signal, resulting in a weaker signal when the object is between the transmitter and vehicle. High frequency radio waves, such as FM broadcasts, are easily deflected by obstructions. Low frequency radio waves, such as AM broadcasts, are much more difficult to deflect.
  1.  Noise problem
    Technicians must have a clear understanding about each customer's noise complaint. Use the following table to diagnose noise problems.

Radio Description

HINT: If the noise does not match the examples above, refer to the descriptions about phasing and multipath.

How to proceed with troubleshooting
1 VEHICLE BROUGHT TO WORKSHOP 2 INSPECT BATTERY VOLTAGE Standard voltage: 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding. 3 BASIC INSPECTION Turn ...

Problem symptoms table
HINT:  Before inspecting the suspected areas listed in the table below, check the fuse and relay.  Before inspecting the suspected areas listed in the table below, check for DTCs. ...

Other materials:

Reassembly
1. INSTALL POWER SLIDE DOOR TOUCH SENSOR LH Install the touch sensor with the 4 screws. Connect the connector. Fix the wire harness inside the door panel with the clip. 2. INSTALL REAR DOOR WIRE SUB-ASSEMBLY LH Install the wire. NOTICE: When installing the wire, push the ...

Removal
1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 2. REMOVE V-BANK COVER SUB-ASSEMBLY (See page EM-28) 3. REMOVE PURGE VSV (a) Disconnect the purge VSV connector. (b) Disconnect the 2 purge line hoses from the purge VSV. (c) Remove the purge VSV from the air cleaner hose. (d) R ...

Removal
1. REMOVE INSTRUMENT CLUSTER NO.1 FINISH PANEL CENTER 2. REMOVE INSTRUMENT CLUSTER NO.2 FINISH PANEL CENTER 3. REMOVE INSTRUMENT CLUSTER FINISH PANEL GARNISH 4. REMOVE NAVIGATION RECEIVER ASSEMBLY WITH BRACKET  Remove the 4 screws.  Disconnect the connector and remove the n ...

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