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.
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HOMESERVICE MANUALSINFINITI2008FX45 AWD V8-4.5L (VK45DE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSBRAKE SIGNAL CIRCUIT
2008 Infiniti FX45 AWD V8-4.5L (VK45DE)
Brake Signal Circuit
2008 Infiniti FX45 AWD V8-4.5L (VK45DE)SECTION Brake Signal Circuit
BRAKE SIGNAL CIRCUIT
Diagnosis Procedure
1. CHECK CAN COMMUNICATION LINE
With CONSULT-III
^ Perform the self-diagnosis.
Without CONSULT-III
^ Perform the self-diagnosis. Refer to AT-91, "Diagnosis Procedure without CONSULT-III". Diagnosis Procedure Without Consult-III
Is a malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to AT-94. U1000
NO >> GO TO 2.
2. CHECK STOP LAMP SWITCH CIRCUIT
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
3. Read out ON/OFF switching action of the "BRAKE SW".
OK or NG
OK >> INSPECTION END
NG >> GO TO 3.
3. CHECK STOP LAMP SWITCH
Check continuity between stop lamp switch harness connector E210 terminals 1 and 2.
Check stop lamp switch after adjusting brake pedal.
OK or NG
OK >> Check the following items. If NG, repair or replace damaged parts.
^ Harness for short or open between battery and stop lamp switch.
^ Harness for short or open between stop lamp switch and unified meter and A/C amp.
NG >> Repair or replace the stop lamp switch.
CONSULT-III Reference Value in Data Monitor Mode:
Diagnosis Procedure
1. CHECK CAN COMMUNICATION LINE
With CONSULT-III
^ Perform the self-diagnosis.
Without CONSULT-III
^ Perform the self-diagnosis. Refer to AT-91, "Diagnosis Procedure without CONSULT-III". Diagnosis Procedure Without Consult-III
Is a malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to AT-94. U1000
NO >> GO TO 2.
2. CHECK STOP LAMP SWITCH CIRCUIT
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
3. Read out ON/OFF switching action of the "BRAKE SW".
OK or NG
OK >> INSPECTION END
NG >> GO TO 3.
3. CHECK STOP LAMP SWITCH
Check continuity between stop lamp switch harness connector E210 terminals 1 and 2.
Check stop lamp switch after adjusting brake pedal.
OK or NG
OK >> Check the following items. If NG, repair or replace damaged parts.
^ Harness for short or open between battery and stop lamp switch.
^ Harness for short or open between stop lamp switch and unified meter and A/C amp.
NG >> Repair or replace the stop lamp switch.
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.