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Home >> Infiniti >> 2004 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1236 (Auto Cruise Control System) >> Auto Cruise Control System - ICC >> Trouble Diagnosis For Self-Diagnostic Items >> DTC 90: Stop Lamp RLY Fix

DTC 90: Stop Lamp RLY Fix

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.
  1. CHECK ICC UNIT CONNECTOR 
    1. Turn ignition switch OFF.
    2. Disconnect and check ICC unit connector.

    OK or NG

    • OK: GO TO 2.
    • NG:
      • Connector malfunction.
      • Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of system.
  2. CHECK STOP LAMP SWITCH AND ICC BRAKE SWITCH 

    With CONSULT-II

    1. Connect ICC unit connector and turn ignition switch ON.
    2. With data monitor, check that "STOP LAMP SW" and "BRAKE SW" operate normally.

    OK or NG

    • OK: GO TO .
    • NG:
      • BRAKE SW: GO TO 3.
      • STOP LAMP SW: GO TO .
  3. CHECK AND ADJUST ICC BRAKE SWITCH 

    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.
  4. CHECK ICC BRAKE SWITCH 

    Check ICC brake switch. Refer to "ICC BRAKE SWITCH AND STOP LAMP SWITCH ".

    OK or NG

    • OK: GO TO 5.
    • 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.
  5. CHECK ICC BRAKE HOLD RELAY 

    Disconnect ICC brake hold relay, and check continuity between ICC brake hold relay terminal 4 and terminal 3.

    • Continuity should exist. 
      Fig 1: Checking Continuity Between ICC Brake Hold Relay Terminal 4 And 3
      G02385991Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 6.
    • 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.
  6. CHECK HARNESS THROUGH ICC BRAKE HOLD RELAY, ICC BRAKE SWITCH, ICC UNIT 
    1. Disconnect ICC brake hold relay, ECM and ICC unit harness connectors.
    2. Check continuity between ICC brake hold relay harness connector E134 terminal 4 (L) and ICC unit harness connector B17 terminal 29 (BR/W).
      • Continuity should exist. 
    3. Check continuity between ICC unit harness connector B17 terminal 29 (BR/W) and ground.
      • Continuity should not exist. 
      Fig 2: Checking Continuity Between ICC Unit Harness Connector B17 Terminal 29 (BR/W) And Ground
      G02385992Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 7.
    • NG:
      • Repair harness between ICC brake hold relay and ICC brake switch.
      • Repair harness between ICC brake switch and ICC unit.
      • Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
  7. CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT 
    1. Turn ignition switch ON.
    2. Check voltage between ICC brake hold relay harness connector E134 terminal 3 (R/B) and ground.
      • Battery voltage should exist 
      Fig 3: Checking Voltage Between ICC Brake Hold Relay Harness Connector E134 Terminal 3 (R/B) And Ground
      G02385993Courtesy 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:
      • Check fuse or ICC brake hold relay power supply system harness.
      • Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
  8. CHECK STOP LAMP SWITCH 
    1. Turn ignition switch OFF.
    2. Check stop lamp switch. Refer to "ICC BRAKE SWITCH AND STOP LAMP SWITCH ".

    OK or NG

    • OK: GO TO 9.
    • NG: Replace 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.
  9. CHECK ICC BRAKE HOLD RELAY CIRCUIT 
    1. Disconnect stop lamp switch connector.
    2. When brake pedal is not depressed, make sure that stop lamp does not illuminate.

    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: GO TO 10.
  10. CHECK ICC BRAKE HOLD RELAY 
    1. Disconnect ICC brake hold relay.
    2. Check continuity between ICC brake hold relay E134 terminal 7 and terminal 6.
      Fig 4: Checking Continuity Between ICC Brake Hold Relay E134 Terminal 7 And Terminal 6
      G02385994Courtesy of NISSAN MOTOR CO., U.S.A.
      • Continuity should not exist. 

    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 hold relay. Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
  11. CHECK HARNESS THROUGH ICC UNIT, ICC BRAKE HOLD RELAY, AND GROUND 
    1. Disconnect ICC unit and ICC brake hold relay harness connectors.
    2. Check continuity between ICC unit harness connector B17 terminal 47 (BR) and ICC brake hold relay harness connector E134 terminal 1 (BR).
      • 47-1 Continuity should exist. 
      Fig 5: Checking Continuity Between ICC Unit Harness Connector B17 Terminal 47 (BR) And ICC Brake Hold Relay Harness Connector E134 Terminal 1 (BR)
      G02385995Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check continuity between ICC unit harness connector B17 terminal 47 (BR) and ground.
      • 47 - Ground Continuity should not exist. 
    4. Check continuity between ICC brake hold relay harness connector E134 terminal 2 (B) and ground.
      • Continuity should exist. 
      Fig 6: Checking Continuity Between ICC Brake Hold Relay Harness Connector E134 Terminal 2 (B) And Ground
      G02385996Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 12.
    • NG:
      • Repair harness through ICC unit and ICC brake hold relay, or between ICC brake hold relay and ground.
      • Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
  12. CHECK ICC BRAKE HOLD RELAY 

    Check continuity between ICC brake hold relay terminal 1 and terminal 2.

    • Continuity should exist 
    • (minimal resistance through coil will exist) 
      Fig 7: Checking Continuity Between ICC Brake Hold Relay Terminal 1 And Terminal 2
      G02385997Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 13.
    • 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.
  13. CHECK ICC UNIT STANDARD VOLTAGE 

    With CONSULT-II

    1. Connect connectors of ICC unit and stop lamp switch.
    2. While performing active test (STOP LAMP: STP LMP DRIVE ON) with CONSULT-II, check voltage between ICC unit harness connector B17 terminal 47 (BR) and ground.
      • 47 - Ground Battery voltage should exist (during active test) 
      Fig 8: Checking Voltage Between ICC Unit Harness Connector B17 Terminal 47 (BR) And Ground
      G02385998Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 14.
    • NG: 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.
  14. CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT 

    Check voltage between ICC brake hold relay harness connector E134 terminal 6 (R/Y) and ground.

    • 6 - Ground Battery voltage should exist 
      Fig 9: Checking Voltage Between ICC Brake Hold Relay Harness Connector E134 Terminal 6 (R/Y) And Ground
      G02385999Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 15.
    • NG:
      • Check fuse or ICC brake hold relay power supply harness.
      • Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
  15. CHECK HARNESS BETWEEN ICC BRAKE HOLD RELAY AND ICC UNIT 
    1. Turn ignition switch OFF.
    2. Disconnect ICC brake hold relay and ICC unit harness connectors.
    3. Check continuity between ICC brake hold relay harness connector E134 terminal 7 (R/G) and ICC unit harness connector B17 terminal 38 (R/G).
      • 7 - 38 Continuity should exist. 
      Fig 10: Checking Continuity Between ICC Brake Hold Relay Harness Connector E134 Terminal 7 (R/G) And ICC Unit Harness Connector B17 Terminal 38 (R/G)
      G02386000Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check continuity between ICC unit harness connector B17 terminal 38 (R/G) and ground.
      • 38 - Ground Continuity should not exist. 

    OK or NG

    • OK: GO TO 16.
    • NG:
      • Repair harness between ICC brake hold relay and ICC unit or between ICC brake hold relay and 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.
  16. CHECK ICC BRAKE HOLD RELAY 

    With CONSULT-II

    1. Connect ICC unit and ICC brake hold relay harness connectors.
    2. Disconnect stop lamp switch connector.
    3. Perform active test (STOP LAMP) with CONSULT-II, and make sure that stop lamps are illuminated.

    OK or NG

    • OK: GO TO 17.
    • 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.
  17. CHECK ICC UNIT STANDARD VOLTAGE 

    With CONSULT-II

    1. Connect stop lamp switch connector.
    2. While performing active test (STOP LAMP: STP LMP DRIVE ON) with CONSULT-II, check voltage between ICC unit harness connector B17 terminal 29 (BR/W) and ground.
      • 29 - Ground Approx. 0V (during active test) 
      Fig 11: Checking Voltage Between ICC Unit Harness Connector B17 Terminal 29 (BR/W) And Ground
      G02386001Courtesy 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: Replace 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.
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