The following warning indicates a possible problem in the brake system.
Immediately stop the vehicle in a safe place and contact your Toyota dealer.

If a warning light turns on or a warning buzzer sounds...
Stop the vehicle immediately.4wd Control Ecu
Components
COMPONENTS
ILLUSTRATION
Removal
REMOVAL
PROCEDURE
1. REMOVE FRONT DOOR SCUFF PLATE RH
2. REMOVE COWL SIDE TRIM SUB-ASSEMBLY RH
3. REMOVE NO. 2 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY
4. REMOVE LOWER INSTRUMENT PANEL SUB-ASSEMBLY
...
Horn Circuit
DESCRIPTION
When the theft deterrent system is switched from the armed state to the alarm
sounding state, the main body ECU (driver side junction block assembly) transmits
a signal to cause the horn to sound at intervals of 0.4 seconds.
WIRING DIAGRAM
...
Starting System
Parts Location
PARTS LOCATION
ILLUSTRATION
ILLUSTRATION
System Diagram
SYSTEM DIAGRAM
...