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Home >> Infiniti >> 2011 >> G37 Convertible V6-3.7L (VQ37VHR) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P1572 >> ICC Brake Switch

ICC Brake Switch


P1572 ICC BRAKE SWITCH





Description
When the brake pedal is depressed, ICC brake switch is turned OFF and stop lamp switch is turned ON. ECM detects the state of the brake pedal by those two types of input (ON/OFF signal). System Description for the ICC function.




DTC Logic

DTC DETECTION LOGIC

NOTE:
- If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. P0605.
- This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.
1st trip DTC is erased when ignition switch is turned OFF. And even when malfunction A is detected in two consecutive trips, DTC is not stored in ECM memory.






DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

NOTE:
The procedure for malfunction B is not described. It takes an extremely long time to complete the procedure for malfunction B. By performing the procedure for malfunction A, the condition that causes malfunction B can be detected.
- GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine (VDC switch OFF).
2. Press MAIN switch and make sure that CRUISE lamp illuminates.
3. 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.





4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES - Go to SEE Diagnosis Procedure.
NO - GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE
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.
Is 1st trip DTC detected?
YES - Go to SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
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 terminals under the following conditions.





Is the inspection result normal?
YES - GO TO 2.
NO-1 - A/T models: GO TO 3.
NO-2 - M/T models: GO TO 8.
2.CHECK OVERALL FUNCTION-II
With CONSULT-III
Select "BRAKE SW2" and check indication under the following conditions.





Without CONSULT-III
Check the voltage between ECM harness connector terminals as per the following.





Is the inspection result normal?
YES - GO TO 22.
NO - GO TO 16.
3.CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ICC brake switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between ICC 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
- 10 A fuse (No. 3)
- Harness for open or short between ICC brake switch and fuse
- Repair open circuit or short to ground in harness or connectors.
5.CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between ICC 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 7.
NO - GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E106, M6
- Harness for open or short between ICC brake switch and ECM
- Repair open circuit, short to ground or short to power in harness or connectors.
7.CHECK ICC BRAKE SWITCH
SEE Component Inspection (ICC Brake Switch).
Is the inspection result normal?
YES - GO TO 22.
NO - Replace ICC brake switch. ICC.
8.CHECK ICC BRAKE SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ICC brake switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between ICC brake switch harness connector and ground.





Is the inspection result normal?
YES - GO TO 13.
NO - GO TO 9.
9.CHECK ASCD CLUTCH SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD clutch switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between ASCD clutch switch harness connector and ground.





Is the inspection result normal?
YES - GO TO 11.
NO - GO TO 10.
10.DETECT MALFUNCTIONING PART
Check the following.
- Fuse block (J/B) connector E103
- 10 A fuse (No. 3)
- Harness for open or short between ASCD clutch switch and fuse
- Repair open circuit or short to ground in harness or connectors.
11.CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I
1. Turn ignition switch OFF.
2. Check the continuity between ASCD clutch switch harness connector and ICC brake switch harness connector.





3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES - GO TO 12.
NO - Repair open circuit, short to ground or short to power in harness or connectors.
12.CHECK ASCD CLUTCH SWITCH
SEE Component Inspection (ASCD Clutch Switch).
Is the inspection result normal?
YES - GO TO 22.
NO - Replace ASCD clutch switch. ICC.
13.CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between ICC 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 15.
NO - GO TO 14.
14.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E106, M6
- Harness for open or short between ICC brake switch and ECM
- Repair open circuit, short to ground or short to power in harness or connectors.
15.CHECK ICC BRAKE SWITCH
SEE Component Inspection (ICC Brake Switch).
Is the inspection result normal?
YES - GO TO 22.
NO - Replace ICC brake switch. ICC.
16.CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Disconnect ICC brake hold relay harness connector.
4. Check the voltage between stop lamp switch harness connector and ground.





5. Check the voltage between ICC brake hold relay harness connector and ground.





Is the inspection result normal?
YES - GO TO 18.
NO - GO TO 17.
17.DETECT MALFUNCTIONING PART
Check the following.
- Fuse block (J/B) connector E103
- 10 A fuse (No. 7)
- Harness for open or short between battery and stop lamp switch
- Harness for open or short between battery and ICC brake hold relay
- Repair open circuit or short to ground in harness or connectors.
18.CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check the continuity between stop lamp switch harness connector and ECM harness connector.





3. Check the continuity between ICC brake hold relay 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 20.
NO - GO TO 19.
19.DETECT MALFUNCTIONING PART
Check the following.
- Fuse block (J/B) connector E103, M2
- Harness for open or short between ECM and stop lamp switch
- Harness for open or short between ECM and ICC brake hold relay
- Repair open circuit, short to ground or short to power in harness or connectors.
20.CHECK STOP LAMP SWITCH
SEE Component Inspection (Stop Lamp Switch).
Is the inspection result normal?
YES - GO TO 21.
NO - Replace stop lamp switch. Exploded View.
21.CHECK ICC BRAKE HOLD RELAY
SEE Component Inspection (ICC Brake Hold Relay).
Is the inspection result normal?
YES - GO TO 22.
NO - Replace ICC brake hold relay.
22.CHECK INTERMITTENT INCIDENT
Intermittent Incident.
- INSPECTION END




Component Inspection (ICC Brake Switch)
1.CHECK ICC BRAKE SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect ICC brake switch harness connector.
3. Check the continuity between ICC brake switch terminals under the following conditions.





Is the inspection result normal?
YES - INSPECTION END
NO - GO TO 2.
2.CHECK ICC BRAKE SWITCH-II
1. Adjust ICC brake switch installation. Inspection and Adjustment.
2. Check the continuity between ICC brake switch terminals under the following conditions.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace ICC brake switch. ICC.




Component Inspection (ASCD Clutch Switch)
1.CHECK ASCD CLUTCH SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect ASCD clutch switch harness connector.
3. Check the continuity between ASCD clutch switch terminals under the following conditions.





Is the inspection result normal?
YES - INSPECTION END
NO - GO TO 2.
2.CHECK ASCD CLUTCH SWITCH-II
1. Adjust ASCD clutch switch installation. Inspection and Adjustment.
2. Check the continuity between ASCD clutch switch terminals under the following conditions.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace ASCD clutch switch. Exploded View.




Component Inspection (Stop Lamp Switch)
1.CHECK STOP LAMP SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check the 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. Inspection and Adjustment.
2. Check the continuity between stop lamp switch terminals under the following conditions.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace stop lamp switch. Exploded View.




Component Inspection (ICC Brake Hold Relay)
1.CHECK ICC BRAKE HOLD RELAY
1. Turn ignition switch OFF.
2. Remove ICC brake hold relay.





3. Check the continuity between ICC brake hold relay terminals under the following conditions.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace ICC brake hold relay
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