Infiniti QX56 (JA60). Manual — part 422
EC-340
< COMPONENT DIAGNOSIS >
[VK56DE]
P1572 ICC BRAKE SWITCH
4. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check the voltage between ICC brake hold relay terminal 4 and
ground with CONSULT-III or tester.
OK or NG
OK
>> GO TO 14.
NG
>> GO TO 6.
6.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M31, E152
• Fuse block (J/B) connector M4
• 10 A fuse (No.15)
• Harness for open or short between ICC brake hold relay and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.
CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ICC brake switch terminal 2 and ECM terminal 108, ICC brake switch
terminal 2 and ICC unit terminal 29.
Refer Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 8.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.
CHECK ICC BRAKE SWITCH
EC-343, "Component Inspection"
OK or NG
OK
>> GO TO 15.
NG
>> Replace ICC brake switch.
9.
CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
Continuity should exist.
Voltage: Battery voltage
MBIB0059E
Continuity should exist.
P1572 ICC BRAKE SWITCH
EC-341
< COMPONENT DIAGNOSIS >
[VK56DE]
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2. Disconnect stop lamp switch harness connector.
3. Check voltage between stop lamp switch terminal 3 and ground
with CONSULT -III or tester.
4. Disconnect ICC brake hold relay.
5. Check voltage between ICC brake hold relay terminal 7 and
ground with CONSULT-III or tester.
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M31, E152
• Fuse block (J/B) connector M60
• 10 A fuse (No. 20)
• Harness for open or short between stop lamp switch and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
11.
CHECK INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
BBIA0470E
Voltage: Battery voltage
PBIB2102E
BBIA0471E
Voltage: Battery voltage
JMBIA0604ZZ
EC-342
< COMPONENT DIAGNOSIS >
[VK56DE]
P1572 ICC BRAKE SWITCH
1. Turn ignition switch OFF.
2. Disconnect ECM 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.
5. Check harness continuity between ECM terminal 101 and ICC hold relay terminal 6.
Refer to Wiring Diagram.
6. Also check harness for short to ground and short to power.
7. Disconnect ICC unit harness connector.
8. Check harness continuity between ECM terminal 101 and ICC unit terminal 38.
Refer to Wiring Diagram.
9. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 13.
NG
>> GO TO 12.
12.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E34, B40
• Harness for open or short between ICC unit and ECM
• Harness for open or short between ECM and ICC brake hold relay
• Harness for open or short between ECM and ICC brake switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
13.
CHECK STOP LAMP SWITCH
EC-343, "Component Inspection"
OK or NG
OK
>> GO TO 14.
NG
>> Replace stop lamp switch.
14.
CHECK ICC BRAKE HOLD RELAY POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND
SHORT
1. Check harness continuity between ICC brake hold relay terminal 1 and ICC unit terminal 47, ICC brake
hold relay terminal 2 and ground.
Refer to Wiring Diagram
2. Also check harness for short to ground or short to power in harness or connectors.
OK or NG
OK
>> GO TO 15.
NG
>> Repair or replace.
15.
CHECK ICC BRAKE HOLD RELAY
EC-343, "Component Inspection"
OK
>> GO TO 16.
NG
>> Replace ICC brake hold relay.
16.
CHECK INTERMITTENT INCIDENT
Continuity should exist.
Continuity should exist.
Continuity should exist.
Continuity should exist
P1572 ICC BRAKE SWITCH
EC-343
< COMPONENT DIAGNOSIS >
[VK56DE]
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GI-35, "How to Check Terminal"
GI-38, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000005149403
ICC BRAKE SWITCH
1. Turn ignition switch OFF.
2. Disconnect ICC brake switch harness connector.
3. Check continuity between ICC brake switch terminals 1 and 2
under the following conditions.
If NG, adjust ICC brake switch installation, refer to
, and perform step 3 again.
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.
If NG, adjust stop lamp switch installation, refer to
, and perform step 3 again.
ICC BRAKE HOLD RELAY
1. Apply 12V direct current between ICC brake hold relay terminals 1 and 2.
2. Check continuity between relay terminals 3 and 4, 6 and 7 under
the following conditions.
3. If NG, replace ICC brake hold relay.
Condition
Continuity
Brake pedal: Fully released.
Should exist.
Brake pedal: Slightly depressed.
Should not exist.
PBIB1536E
Condition
Continuity
Brake pedal: Fully released.
Should not exist.
Brake pedal: Slightly depressed.
Should exist.
PBIB2103E
Condition
Between terminals
Continuity
12V direct current supply
between terminals 1 and 2
3 and 4
Should not exist
6 and 7
Should exist
No current supply
3 and 4
Should exist
6 and 7
Should not exist
MBIB0063E
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