Toyota Avalon (XX50): Panel Switches do not Function. Parking Brake Switch Circuit. Parts Location
Panel Switches do not Function
CAUTION / NOTICE / HINT
NOTICE:
- Depending on the parts that are replaced during vehicle inspection or
maintenance, performing initialization, registration or calibration may
be needed. Refer to Precaution for Navigation System.
Click here 
- When replacing the radio and display receiver assembly, always replace
it with a new one. If a radio and display receiver assembly which was
installed to another vehicle is used, the following may occur:
- A communication malfunction DTC may be stored.
- The radio and display receiver assembly may not operate normally.
PROCEDURE
(a) Check for foreign matter around the switches that might prevent operation.
OK:
No foreign matter is found.
| NG |
 | REMOVE ANY FOREIGN MATTER FOUND |
|
OK |
 | |
| 2. |
CHECK PANEL & STEERING SWITCH (OPERATION CHECK) |
| (a) Enter the "Panel & Steering Switch Check Mode" screen. Refer to Check Panel & Steering Switch in Operation Check.
Click here | |
(b) Operate the abnormal switch and check if the switch status is correctly displayed.
OK:
The switch status is correctly displayed as operated.
| OK |
| REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY |
| NG |
| PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
Parking Brake Switch Circuit
DESCRIPTION
This circuit is from the skid control ECU (brake actuator assembly) to the radio and display receiver assembly.
WIRING DIAGRAM
PROCEDURE
| 1. |
CHECK BRAKE WARNING LIGHT |
(a) Check that the brake warning light comes on when the parking brake is applied and goes off when it is released.
OK:
The brake warning light operates as specified above.
| NG |
 | GO TO BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS |
|
OK |
 | |
| 2. |
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - RADIO AND DISPLAY RECEIVER ASSEMBLY) |
(a) Disconnect the G2 radio and display receiver assembly connector.
(b) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|
G2-20 (PKB) - A28-33 (PKB) |
Always | Below 1 Ω |
|
G2-20 (PKB) or A28-33 (PKB) - Body ground |
Always | 10 kΩ or higher |
| OK |
| PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
Parts Location
PARTS LOCATION
ILLUSTRATION
|
*1 | ROOF CONSOLE BOX SUB-ASSEMBLY |
*2 | TELEPHONE MICROPHONE ASSEMBLY |
|
*3 | SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) |
*4 | INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
- ECU-ACC FUSE - ECU-DCC NO. 2 FUSE - ECU-IG1 NO. 4 FUSE
- ECU-IG2 NO. 3 FUSE (w/ Manual (SOS) Switch) - DCM FUSE (w/ Manual (SOS) Switch)
- PANEL FUSE - METER-IG2 FUSE - RADIO FUSE - ECU-B NO. 2 FUSE |
|
*5 | NO. 2 ENGINE ROOM RELAY BLOCK AND NO. 2 JUNCTION BLOCK ASSEMBLY
- AMP NO. 1 FUSE - AMP NO. 2 FUSE |
- | - |
ILLUSTRATION
|
*1 | NAVIGATION ANTENNA ASSEMBLY |
*2 | SPIRAL CABLE SUB-ASSEMBLY |
|
*3 | STEERING PAD SWITCH ASSEMBLY |
*4 | NO. 4 ANTENNA CORD SUB-ASSEMBLY |
|
*5 | STEREO JACK ADAPTER ASSEMBLY |
*6 | COMBINATION METER ASSEMBLY |
|
*7 | DLC3 |
*8 | RADIO AND DISPLAY RECEIVER ASSEMBLY |
|
*9 | NO. 5 ANTENNA CORD SUB-ASSEMBLY |
*10 | NAVIGATION ECU |
|
*11 | HEADUP DISPLAY (METER MIRROR SUB-ASSEMBLY) |
*12 | DCM (TELEMATICS TRANSCEIVER)
(w/ Manual (SOS) Switch) |
|
*13 | - GPS |
- | - |
ILLUSTRATION
|
*1 | FRONT NO. 1 SPEAKER ASSEMBLY LH |
*2 | FRONT NO. 1 SPEAKER ASSEMBLY RH |
|
*3 | FRONT NO. 2 SPEAKER ASSEMBLY LH |
*4 | FRONT NO. 2 SPEAKER ASSEMBLY RH |
|
*5 | FRONT NO. 4 SPEAKER ASSEMBLY |
*6 | FRONT NO. 3 SPEAKER ASSEMBLY RH |
|
*7 | FRONT NO. 3 SPEAKER ASSEMBLY LH |
*8 | REAR SPEAKER ASSEMBLY LH |
|
*9 | REAR SPEAKER ASSEMBLY RH |
*10 | REAR NO. 2 SPEAKER ASSEMBLY LH |
|
*11 | REAR NO. 2 SPEAKER ASSEMBLY RH |
*12 | SPEAKER ASSEMBLY WITH BRACKET RH |
|
*13 | SPEAKER ASSEMBLY WITH BRACKET LH |
*14 | REAR NO. 3 SPEAKER ASSEMBLY |
|
*15 | STEREO COMPONENT AMPLIFIER ASSEMBLY |
- | - |
ILLUSTRATION
|
*1 | RADIO SETTING CONDENSER |
*2 | WINDOW GLASS ANTENNA WIRE |
|
*3 | NO. 2 AMPLIFIER ANTENNA ASSEMBLY |
*4 | NO. 3 ANTENNA CORD SUB-ASSEMBLY |
|
*5 | TELEPHONE ANTENNA ASSEMBLY (w/ SXM Function)
- SiriusXM | *6 |
NO. 2 ANTENNA CORD SUB-ASSEMBLY (w/ SXM Function) |
|
*7 | ANTENNA CORD SUB-ASSEMBLY |
*8 | NO. 1 AMPLIFIER ANTENNA ASSEMBLY |
|
*9 | - FM Main - AM |
*10 | - FM Sub |
