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Home >> Lexus >> 2017 >> IS 300 F Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 132 (Automatic Transmission System (Aa81E, For 8AR-FTS) - Diagnostic Codes (1 Of 4)) >> AUTOMATIC TRANSMISSION SYSTEM (for 8AR-FTS) >> DTC P0703-12: Brake Switch "B" Circuit Short to Battery [08/2015 - ] >> Description

DTC P0703-12: Brake Switch "B" Circuit Short to Battery [08/2015 - ]: Description

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The purpose of this circuit is to prevent the engine from stalling when the brakes are suddenly applied while driving in the lock-up condition.

When the brake pedal is depressed, the stop light switch assembly sends a signal to the ECM. The ECM then cancels the operation of the lock-up clutch while braking is in progress.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P0703-12 Brake Switch "B" Circuit Short to Battery 1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other
  1. The engine switch is on (IG) and battery voltage is 8 V or more.
  2. The stop light switch remains on.
  3. The vehicle is driven in GO (30 km/h (19 mph) or more) and STOP (less than 3 km/h (2 mph)) pattern 5 times
  4. 2-trip detection logic
  • Stop light switch assembly
  • Short in stop light switch signal circuit
  • ECM
 Comes on DTC stored SAE Code:
P0724
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