DTC 45: Brake SW/Stop L SW

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CONNECTORS FOR ICC UNIT
1. Turn ignition switch OFF.
2. Disconnect ICC unit connectors and connect them securely again. Erase DTC, then perform self-diagnosis of ICC system again.
OK or NG
- OK:
  - Poor connector connection.
  - Check connectors. Check connectors housing for disconnected, loose, bent, and collapsed terminals. If any malfunction is detected, repair as necessary. Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
- NG: GO TO 2.
CHECK STOP LAMP SWITCH AND ICC BRAKE SWITCH
With CONSULT-II

With data monitor, check if "STOP LAMP SW" and "BRAKE SW" are operating normally.

OK or NG
- OK: Replace ICC unit. Refer to "ICC UNIT ". Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
- NG:
  - BRAKE SW: GO TO 3.
  - STOP LAMP SW: GO TO 5.
ICC BRAKE SWITCH INSTALLATION AND ADJUSTMENT INSPECTION
Check ICC brake switch for proper installation and adjust if necessary. Refer to "BRAKE PEDAL ".

OK or NG
- OK: GO TO 4.
- NG: After adjustment, erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
CHECK ICC BRAKE SWITCH
Check ICC brake switch. Refer to "ICC BRAKE SWITCH AND STOP LAMP SWITCH ".

OK or NG
- OK: Replace ICC unit. Refer to "ICC UNIT ". Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
- NG: Replace ICC brake switch. Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
CHECK STOP LAMP ILLUMINATION
Check stop lamp illumination.

OK or NG
- OK: GO TO 6.
- NG:
  - Check stop lamp circuit. Refer to "STOP LAMP ".
  - Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
CHECK ICC BRAKE HOLD RELAY
1. Turn ignition switch OFF.
2. Remove ICC brake hold relay.
3. Check continuity between ICC brake hold relay terminals.
  - 7 - 6 Continuity should not exist.
  - 4 - 3 Continuity should exist.
  Fig 1: Checking Continuity Between ICC Brake Hold Relay Terminals
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 7.
- NG: Replace ICC brake hold relay. Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
CHECK ICC BRAKE HOLD RELAY CIRCUIT
1. Disconnect ICC unit and stop lamp switch connectors.
2. Check continuity between ICC unit harness connector B17 terminal 38 (R/G) and ICC brake hold relay harness connector E134 terminal 7 (R/G).
  - Continuity should exist.
3. Check continuity between ICC unit harness connector B17 terminal 38 (R/G) and stop lamp switch harness connector E38 terminal 4 (R/G).
  - Continuity should exist.
  Fig 2: Identifying ICC Unit Connector, ICC Brake Hold Relay Connector And Stop Lamp Switch Harness Connector E38 Terminal 4 (R/G)
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: Replace ICC unit. Refer to "ICC UNIT ". Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
- NG:
  - Repair harness between ICC unit and ICC brake hold relay or stop lamp switch.
  - Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.