Infiniti Q45. Manual — part 496
DTC P1805 BRAKE SWITCH
EC-623
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D
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F
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J
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EC
Wiring Diagram
NBS0025U
TBWM1249E
EC-624
DTC P1805 BRAKE SWITCH
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic Procedure
NBS0025V
1.
CHECK STOP LAMP SWITCH CIRCUIT
1.
Turn ignition switch OFF.
2.
Check the stop lamp when depressing and releasing the brake pedal.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 2.
2.
CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1.
Disconnect stop lamp switch harness connector.
2.
Check voltage between stop lamp switch terminal 3 and ground
with CONSULT-II or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
101
R/W
Stop lamp switch
[Ignition switch: OFF]
●
Brake pedal: Fully released
Approximately 0V
[Ignition switch: OFF]
●
Brake pedal: Slightly depressed
BATTERY VOLTAGE
(11 - 14V)
Brake pedal
Stop lamp
Fully released
Not illuminated
Slightly depressed
Illuminated
PBIB2433E
Voltage: Battery voltage
PBIB2102E
DTC P1805 BRAKE SWITCH
EC-625
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F
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A
EC
3.
DETECT MALFUNCTIONING PART
Check the following.
●
Fuse block (J/B) No. 1 connector M1
●
10A fuse
●
Harness connectors M61, M401
●
Harness for open and short between stop lamp switch and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Disconnect stop lamp switch harness connector.
3.
Check harness continuity between ECM terminal 101 and stop
lamp switch terminal 4.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors M401, M61
●
Harness connectors M135, F105
●
Harness for open or short between ECM and stop lamp switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.
CHECK STOP LAMP SWITCH
Refer to
EC-626, "Component Inspection"
OK or NG
OK
>> GO TO 7.
NG
>> Replace stop lamp switch.
7.
CHECK INTERMITTENT INCIDENT
Refer to
EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END
Continuity should exist.
PBIB2433E
EC-626
DTC P1805 BRAKE SWITCH
Component Inspection
NBS0025W
STOP LAMP SWITCH
1.
Turn ignition switch OFF.
2.
Disconnect stop lamp switch harness connector.
3.
Check continuity between stop lamp switch terminals 3 and 4
under the following conditions.
4.
If NG, adjust stop lamp switch installation, refer to
, and perform step 3 again.
Conditions
Continuity
Brake pedal: Fully released
Should not exist.
Brake pedal: Slightly depressed
Should exist.
PBIB2103E
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