Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Test G307559p12: C1446; Brake Light Switch Circuit Failure
2006 Jaguar XJ (X350) V8-4.2L SCSECTION Pinpoint Test G307559p12: C1446; Brake Light Switch Circuit Failure
PINPOINT TEST G307559p12: C1446; BRAKE LIGHT SWITCH CIRCUIT FAILURE
G307559t62: CHECK THE BRAKE LIGHT SWITCH OUTPUT VOLTAGE
1. Turn the ignition switch to the OFF position.
2. Disconnect the rear electronic module (REM) electrical connector CR13.
3. Turn the ignition switch to the ON position.
4. Depress the brake pedal.
5. Measure the voltage between CR13, pin 13 (GO) and GROUND.
^ Is the voltage less than 10 volts?
-> Yes GO to Pinpoint Test G307559t63.
-> No INSTALL a new rear electronic module (REM). CLEAR the DTC. TEST the system for normal operation.
G307559t63: CHECK THE BRAKE LIGHT SWITCH SUPPLY VOLTAGE
1. Disconnect the brake light switch electrical connector CR78.
2. Measure the voltage between CR78, pin 01 (NG) and GROUND.
^ Is the voltage less than 10 volts?
-> Yes REPAIR the circuit between the battery and the brake light switch electrical connector CR78, pin 01 (NG). This circuit includes the primary junction box (fuse 44). For additional information, refer to Vehicle/Diagrams. CLEAR the DTC. TEST the system for normal operation.
-> No GO to Pinpoint Test G307559t64.
G307559t64: CHECK THE CONTINUITY OF THE BRAKE LIGHT SWITCH OUTPUT CIRCUIT
1. Measure the resistance between CR78, pin 02 (GO), and CR13, pin 13 (GO).
^ Is the resistance greater than 5 ohms?
-> Yes REPAIR the high resistance circuit. For additional information, refer to Vehicle/Diagrams. CLEAR the DTC. TEST the system for normal operation.
-> No INSTALL a new brake light switch. CLEAR the DTC. TEST the system for normal operation.
G307559t62: CHECK THE BRAKE LIGHT SWITCH OUTPUT VOLTAGE
1. Turn the ignition switch to the OFF position.
2. Disconnect the rear electronic module (REM) electrical connector CR13.
3. Turn the ignition switch to the ON position.
4. Depress the brake pedal.
5. Measure the voltage between CR13, pin 13 (GO) and GROUND.
^ Is the voltage less than 10 volts?
-> Yes GO to Pinpoint Test G307559t63.
-> No INSTALL a new rear electronic module (REM). CLEAR the DTC. TEST the system for normal operation.
G307559t63: CHECK THE BRAKE LIGHT SWITCH SUPPLY VOLTAGE
1. Disconnect the brake light switch electrical connector CR78.
2. Measure the voltage between CR78, pin 01 (NG) and GROUND.
^ Is the voltage less than 10 volts?
-> Yes REPAIR the circuit between the battery and the brake light switch electrical connector CR78, pin 01 (NG). This circuit includes the primary junction box (fuse 44). For additional information, refer to Vehicle/Diagrams. CLEAR the DTC. TEST the system for normal operation.
-> No GO to Pinpoint Test G307559t64.
G307559t64: CHECK THE CONTINUITY OF THE BRAKE LIGHT SWITCH OUTPUT CIRCUIT
1. Measure the resistance between CR78, pin 02 (GO), and CR13, pin 13 (GO).
^ Is the resistance greater than 5 ohms?
-> Yes REPAIR the high resistance circuit. For additional information, refer to Vehicle/Diagrams. CLEAR the DTC. TEST the system for normal operation.
-> No INSTALL a new brake light switch. CLEAR the DTC. TEST the system for normal operation.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.