LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2021 >> RC F Base >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Dynamic Radar Cruise Control System - Diagnostic Codes & Circuit Tests >> Dynamic Radar Cruise Control System >> DTC C1A05: Stop Light Switch Circuit [11/2017 - 01/2023] >> Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC C1A05: Stop Light Switch Circuit [11/2017 - 01/2023]: Description

When the brake pedal is depressed, the stop light switch assembly sends a brake pedal operation signal to the driving support ECU assembly. After reception of this signal, the driving support ECU assembly cancels the dynamic radar cruise control system. When the driving support ECU assembly detects a problem in the stop light switch circuit, DTC C1A05 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A05 Stop Light Switch Circuit When the engine switch is on (IG) and the dynamic radar cruise control system is turned on using the cruise control main switch (ON/OFF button), the driving support ECU assembly detects a malfunction in the signal from the stop light switch circuit.
  • Stop light switch assembly
  • Harness or connector
  • Driving support ECU assembly