Pressing Power Switch Does Not Start System: Wiring Diagram

WARNING: This page is about a different car, the 2004 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Power Switch Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT RADIO RECEIVER ASSY (BU+B, ACC+B, GND)

Check that the continuity between terminals at each condition, as shown in the chart.

Fig 2: Inspecting Radio Receiver Assy (Bu+B, Acc+B, Gnd) 6 Speaker (Built In AMP)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

STANDARD

Tester connection	Condition	Specified condition
GND<=> Body ground	Constant	Continuity

Check that the voltage between terminals at each condition, as shown in the chart.

Fig 3: Inspecting Radio Receiver Assy (Bu+B, Acc+B, Gnd) Except 6 Speaker (Separate Amp)

STANDARD

Tester connection	Condition	Specified condition
BU+B<=>ND	Constant	10-14 V
ACC+B<=>GND	Ignition switch ACC or ON	10 - 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK AND REPLACE RADIO RECEIVER ASSY