DTC B1256/56: Center Cluster Integration Panel Switch Circuit Diagnosis

WARNING: This page is about a different car, the 2003 Lexus RX 300 and 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.

These DTCs notify how the switch works as follows:

If the DTC is not output when operating switch, it means failure of switch contact.
If DTC is output when not operating the switch, it means the switch is stuck.

When something wrong is found by this diagnosis, inspect each switch. Then, replace the switch if there is a problem, or check the wiring harness if there is no problem.

Detecting Condition - Stuck switch.

Trouble Area

Multi Function Switch.
Power Switch.
Sound Mode Switch.
Clock Switch.
CD Switch.
TAPE Switch.
FM 1/2 Switch.
AM Switch.
INFO Switch.
BRIGHTNESS Switch.
TUNE SEEK TRAC Switch.
Eject Switch.
MUTE Switch.
MODE Switch.
A/C Switch.
R/F Switch.
REAR Defogger Switch.
FRONT Defroster Switch.
OFF Switch.
AUTO Switch.
Center Cluster Integration Panel.
Wiring Harness.

For switch inspection, see INSTRUMENT PANEL article in ACCESSORIES & EQUIPMENT.