2008 NISSAN TEANA brake light

EC-274
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
P1572 ASCD BRAKE SWITCH
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES >> Go to EC-274, "Diagnosis Procedure".
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Drive the vehicle for at least 5 consecutive seconds under the following conditions.
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle.
If a road test is expected to be easier, it is unnecessary to lift the vehicle.
2. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES >> Go to EC-274, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000003856755
1.CHECK OVERALL FUNCTION-I
With CONSULT-III
1. Turn ignition switch ON.
2. Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT-III.
3. Check “BRAKE SW1” indication under the following conditions.
Without CONSULT-III
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 3.
2.CHECK OVERALL FUNCTION-II
With CONSULT-III
Check “BRAKE SW2” indication in “DATA MONITOR” mode.
VHCL SPEED SE More than 30 km/h (19 mph)
Selector lever Suitable position
Driving locationDepress the brake pedal for more than 5
seconds so as not to come off from the
above-mentioned vehicle speed.
Monitor item Condition Indication
BRAKE SW1 Brake pedalSlightly depressed OFF
Fully released ON
ECM
Condition Voltage +−
Connector Terminal Connector Terminal
E1611 0
(ASCD brake switch signal)E16 112 Brake pedalSlightly depressed Approx. 0V
Fully released Battery voltage

P1572 ASCD BRAKE SWITCH
EC-275
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
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Without CONSULT-III
Check the voltage between ECM harness connector and ground.
Is the inspection result normal?
YES >> GO TO 12.
NO >> GO TO 7.
3.CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between ASCD brake switch harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
 Fuse block (J/B) connector E103
 10A fuse (No.3)
 Harness for open or short between ASCD brake switch and fuse
>> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between ASCD brake switch harness connector and ECM harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
6.CHECK ASCD BRAKE SWITCH
Refer to EC-277, "
Component Inspection (ASCD Brake Switch)"
Monitor item Condition Indication
BRAKE SW2 Brake pedalSlightly depressed ON
Fully released OFF
ECM
Condition Voltage +−
Connector Terminal Connector Terminal
E16106
(Stop lamp switch signal)E16 112 Brake pedalSlightly depressed Battery voltage
Fully released Approx. 0V
ASCD brake switch
Ground Voltage
Connector Terminal
E49 1 Ground Battery voltage
ASCD brake switch ECM
Continuity
Connector Terminal Connector Terminal
E49 2 E16 110 Existed

P1572 ASCD BRAKE SWITCH
EC-277
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
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Component Inspection (ASCD Brake Switch)INFOID:0000000003856756
1.CHECK ASCD BRAKE SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.CHECK ASCD BRAKE SWITCH-II
1. Adjust ASCD brake switch installation. Refer to BR-6, "
Inspection and Adjustment".
2. Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace ASCD brake switch.
Component Inspection (Stop Lamp Switch)INFOID:0000000003856757
1.CHECK STOP LAMP SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check harness continuity between stop lamp switch terminals under the following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.CHECK STOP LAMP SWITCH-II
1. Adjust stop lamp switch installation. Refer to BR-6, "
Inspection and Adjustment".
2. Check harness continuity between stop lamp switch terminals under the following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace stop lamp switch.
Terminals Condition Continuity
1 and 2 Brake pedalFully released. Existed
Slightly depressed. Not existed
Terminals Condition Continuity
1 and 2 Brake pedalFully released. Existed
Slightly depressed. Not existed
Terminals Condition Continuity
1 and 2 Brake pedalFully released Not existed
Slightly depressed Existed
Terminals Condition Continuity
1 and 2 Brake pedalFully released Not existed
Slightly depressed Existed

P1805 BRAKE SWITCH
EC-291
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
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P1805 BRAKE SWITCH
DescriptionINFOID:0000000003856776
Brake switch signal is applied to the ECM through the stop lamp switch when the brake pedal is depressed.
This signal is used mainly to decrease the engine speed when the vehicle is being driver.
DTC LogicINFOID:0000000003856777
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Fully depress the brake pedal for at least 5 seconds.
3. Erase the DTC.
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-291, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000003856778
1.CHECK STOP LAMP SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Check the stop lamp when depressing and releasing the brake pedal.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 2.
2.CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Disconnect stop lamp switch harness connector.
2. Check the voltage between stop lamp switch harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
 Fuse block (J/B) connector E103
 10A fuse (No.7)
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1805 Brake switchA brake switch signal is not sent to ECM for ex-
tremely long time while the vehicle is being driv-
er. Harness or connectors
(Stop lamp switch circuit is open or short-
ed.)
 Stop lamp switch
Brake pedal Stop lamp
Fully released Not illuminated
Slightly depressed Illuminated
Stop lamp switch
Ground Voltage
Connector Terminal
E115 1 Ground Battery voltage

EC-292
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
P1805 BRAKE SWITCH
 Harness for open or short between battery and stop lamp switch
>> Repair open circuit, 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 stop lamp switch harness connector.
2. Disconnect ECM harness connector.
3. Check the continuity between stop lamp switch harness connector and ECM harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
 Fuse block (J/B) connector E103
 Harness for open or short between ECM and stop lamp switch
>> Repair open circuit, short to ground or short to power in harness or connectors.
6.CHECK STOP LAMP SWITCH
Refer to EC-292, "
Component Inspection (Stop Lamp Switch)".
Is the inspection result normal?
YES >> GO TO 7.
NO >> Replace stop lamp switch.
7.CHECK INTERMITTENT INCIDENT
Refer to GI-35, "
Intermittent Incident".
>> INSPECTION END
Component Inspection (Stop Lamp Switch)INFOID:0000000003858144
1.CHECK STOP LAMP SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check harness continuity between stop lamp switch terminals under the following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.CHECK STOP LAMP SWITCH-II
1. Adjust stop lamp switch installation. Refer to BR-6, "
Inspection and Adjustment".
2. Check harness continuity between stop lamp switch terminals under the following conditions.
Stop lamp switch ECM
Continuity
Connector Terminal Connector Terminal
E115 2 E16 106 Existed
Terminals Condition Continuity
1 and 2 Brake pedalFully released Not existed
Slightly depressed Existed

P1805 BRAKE SWITCH
EC-293
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
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Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace stop lamp switch.
Terminals Condition Continuity
1 and 2 Brake pedalFully released Not existed
Slightly depressed Existed

ASCD BRAKE SWITCH
EC-321
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
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ASCD BRAKE SWITCH
DescriptionINFOID:0000000003858142
When the brake pedal is depressed, ASCD brake switch is turned OFF and stop lamp switch is turned ON.
ECM detects the state of the brake pedal by two kinds of input (ON/OFF signal).
Refer to EC-51, "
System Diagram" for the ASCD function.
Component Function CheckINFOID:0000000003856821
1.CHECK ASCD BRAKE SWITCH FUNCTION
With CONSULT-III
1. Turn ignition switch ON.
2. Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT-III.
3. Check “BRAKE SW1” indication under the following conditions.
Without CONSULT-III
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-321, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003856822
1.CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between ASCD brake switch harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.DETECT MALFUNCTIONING PART
Check the following.
 Fuse block (J/B) connector E103
 10A fuse (No.3)
 Harness for open or short between ASCD brake switch and fuse
>> Repair open circuit, short to ground or short to power in harness or connectors.
Monitor item Condition Indication
BRAKE SW1 Brake pedalSlightly depressed OFF
Fully released ON
ECM
Ground Condition Voltage
Connector Terminal
E1611 0
(ASCD brake
switch signal)Ground Brake pedalSlightly depressed Approx. 0 V
Fully released Battery voltage
ASCD brake switch
Ground Voltage
Connector Terminal
E49 1 Ground Battery voltage

EC-322
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
ASCD BRAKE SWITCH
3.CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between ASCD brake switch harness connector and ECM harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK ASCD BRAKE SWITCH
Refer to EC-322, "
Component Inspection (ASCD Brake Switch)".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace ASCD brake switch.
5.CHECK INTERMITTENT INCIDENT
Refer to GI-35, "
Intermittent Incident".
>> INSPECTION END
Component Inspection (ASCD Brake Switch)INFOID:0000000003858143
1.CHECK ASCD BRAKE SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.CHECK ASCD BRAKE SWITCH-II
1. Adjust ASCD brake switch installation. Refer to BR-6, "
Inspection and Adjustment".
2. Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace ASCD brake switch.
ASCD brake switch ECM
Continuity
Connector Terminal Connector Terminal
E49 2 E16 110 Existed
Terminals Condition Continuity
1 and 2 Brake pedalFully released. Existed
Slightly depressed. Not existed
Terminals Condition Continuity
1 and 2 Brake pedalFully released. Existed
Slightly depressed. Not existed