Pinpoint Test G92304p8: Check the Brake Light Switch Circuit

PINPOINT TEST G92304p8: CHECK THE BRAKE LIGHT SWITCH CIRCUIT

G92304t42: CHECK THE POWER SUPPLY TO THE BRAKE LIGHT SWITCH

1. Disconnect the brake light switch electrical connector, PA03.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between PA03, pin 03 (NR) and GROUND.
^ Is the voltage less than 10 volts?

-> Yes
REPAIR the circuit between the brake light switch and battery. This circuit includes the central junction box (fuse 90), and the ignition switch. For additional information, refer to the wiring diagrams, test the system for normal operation.

-> No
GO to Pinpoint Test G92304t43.

G92304t43: CHECK THE CIRCUIT BETWEEN THE BRAKE LIGHT SWITCH AND THE ABS/DSC MODULE FOR HIGH RESISTANCE

1. Turn the ignition switch to the OFF position.
2. Disconnect the ABS/DSC module electrical connector, JB45/JB185.
3. Measure the resistance between PA03, pin 03 (NR) and JB45/JB185, pin 32 (GO).
^ Is the resistance greater than 5 ohms?

-> Yes
REPAIR the high resistance circuit. This circuit includes the central junction box. For additional information, refer to the wiring diagrams, test the system for normal operation.

-> No
GO to Pinpoint Test G92304t44.

G92304t44: CHECK THE CIRCUIT BETWEEN THE BRAKE LIGHT SWITCH AND THE ABS/DSC MODULE FOR SHORT CIRCUIT TO BATTERY

1. Measure the voltage between PA03, pin 03 (NR) and GROUND.
^ Is the voltage greater than 3 volts?

-> Yes
REPAIR the short circuit. This circuit includes the central junction box. For additional information, refer to the wiring diagrams, test the system for normal operation.

-> No
GO to Pinpoint Test G92304t45.

G92304t45: CHECK THE FUNCTION OF THE BRAKE LIGHT SWITCH

1. Connect an ohmmeter across pins 01 and 03 of the brake light switch.
2. Operate the brake pedal.
3. Measure the resistance across the switch as the pedal is operated up and down.
^ Does the resistance switch between open and closed circuit as the pedal is operated?

-> Yes
Please check part is not on any form of prior authorization before replacement.

-> No
INSTALL a new brake light switch. TEST the system for normal operation.