High Mount Stop Lamp Inoperative
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High Mount Stop Lamp Inoperative
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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5V Reference
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C0277 06
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C0277 06
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C0277 07
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-
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Signal
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C0277 06
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C0277 06
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C0277 07
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C0277 09
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Center High Mounted Stop Lamp Control
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1
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1
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2
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-
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Low Reference
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-
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1
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-
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-
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1. Center High Mounted Stop Lamp Malfunction
2. Center High Mounted Stop Lamp Always ON
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Circuit/System Description
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The brake pedal position (BPP) sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position (BPP) sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5 V reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery voltage to the stop lamp control circuit and center high mounted stop lamp control circuit. When the control circuit is energized the stop lamps and the center high mounted stop lamp are illuminated.
Schematic Reference
Exterior Lights Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for information on diagnostic tools
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Circuit/System Verification
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1.
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Ignition ON, observe the scan tool Brake Switch parameter. The reading should be between Inactive/Active and change when the brake pedal is pushed or released.
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2.
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If the reading did not change between Inactive/Active, refer to Brake Pedal Position Sensor Malfunction.
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3.
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Ignition ON, perform the Brake Lamp Command test. The brake lamps should be ON/OFF.
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4.
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If the brake lamps did not turn ON and OFF, refer to Center High Mounted Brake Lamp Malfunction.
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Brake Pedal Position Sensor Malfunction
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1.
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Ignition OFF, disconnect the harness connector at the B22 Brake Pedal Position Sensor.
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2.
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Ignition OFF, test for less than 5 Ω between the low reference circuit terminal C and ground.
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3.
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If greater than the specified range, test the low reference circuit for an open/high resistance.
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4.
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If the circuit tests normal, replace the K9 Body Control Module.
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Center High Mounted Brake Lamp Malfunction
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1.
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Ignition OFF, disconnect the harness connector at the E6 Center High Mounted Stop Lamp.
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2.
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Test for less than 5 Ω between the E6 Center High Mounted Stop Lamp ground circuit harness connector terminal 2 and ground.
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3.
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If greater than the specified range, test the ground circuit for an open/high resistance.
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4.
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Connect a test lamp between the E6 Center High Mounted Stop Lamp control circuit harness connector terminal 3 and ground.
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5.
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Command the Center Brake Lamp Command test with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
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6.
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If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
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7.
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If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
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8.
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If all circuits test normal, replace the E6 Center High Mounted Stop Lamp.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
