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Home >> Nissan-Datsun >> 2023 >> Rogue Midnight Edition, AWD >> Repair and Diagnosis >> Electrical >> Body Electrical >> Power Control System (IPDM E/R) >> System Description >> System >> Relay Control System >> Fail-safe

Relay Control System: Fail-safe

FAIL-SAFE CONTROL BY DTC 

IPDM E/R performs fail-safe control when any DTC are detected.

DTC No. CONSULT display Fail-safe
B121A-11 FR FOG LAMP LH PWR SPLY CIRC [CIRCUIT SHORT TO GROUND] Shuts off the power supply to the front fog lamp LH power supply circuit until the front fog lamp ON conditions are no longer satisfied.
B1256-11 FR FOG LAMP RH PWR SPLY CIRC [CIRCUIT SHORT TO GROUND] Shuts off the power supply to the front fog lamp RH power supply circuit until the front fog lamp ON conditions are no longer satisfied.
B12A4-81 Battery current sensor [INVALID SERIAL DATA RECEIVED] Fix the power generation command value to 14.3 V.
B12A4-92 Battery current sensor [PFM/INCORRECT OPERATN]
B20A2-87 Headlamp (RH) LIN communication [MISSING MESSAGE]
  • Transmits the headlamp warning signal (CAN communication) to the combination meter (when the ignition switch is placed ON, the headlamp warning is displayed on the information display of the combination meter).
  • Transmits the request signal (via LIN communication) to the both side LED headlamp control module, and turns ON the headlamp (LO) and parking lamp.
B20A4-87 Headlamp (LH) LIN communication [MISSING MESSAGE]
B20C7-11 A/C clutch [CIRCUIT SHORT TO GROUND] Inhibit A/C compressor (magnetic clutch) operation.
B20C7-15 A/C clutch [CIRC SHORT TO BATT OR OPEN]
B20D4-11 TAIL LAMP LH PWR SPLY CIRC [CIRCUIT SHORT TO GROUND] Shuts off the power supply to the following power supply circuits until the license plate lamp, side marker lamp and tail lamp ON conditions are no longer satisfied:
  • Tail lamp
  • License plate lamp
  • Side marker lamp
B20E2-96 LED HEADLAMP RH [CMPNENT INTERNAL MLFNCTN]
  • Transmits the headlamp warning signal (CAN communication) to the combination meter (when the ignition switch is placed ON, the headlamp warning is displayed on the information display of the combination meter).
  • Transmits the request signal (via LIN communication) to the both side LED headlamp control module, and turns ON the headlamp (LO) and parking lamp.
B20E3-96 LED HEADLAMP LH [CMPNENT INTERNAL MLFNCTN]
U0073-00 Control module comm Bus A Off [NO SUBTYPE INFO] Refer to CAN COMMUNICATION CONTROL of following.
U2140-87 CAN comm err (ECM) [MISSING MESSAGE]
U214F-87 CAN comm err (BCM) [MISSING MESSAGE]

CAN COMMUNICATION CONTROL 

When CAN communication with ECM and BCM is impossible, IPDM E/R performs fail-safe control. After CAN communication recovers normally, it also returns to normal control.

If No CAN Communication Is Available With ECM 

Control part Fail-safe operation
Cooling fan
  • The cooling fan is operated at HI operation when the ignition switch is placed ON.
  • Turn OFF the cooling fan operation when the ignition switch is placed OFF.
A/C compressor A/C compressor OFF

If No CAN Communication Is Available With BCM 

Control part Fail-safe operation
Headlamp
  • Turns ON the headlamp (LO) when the ignition switch is placed turned ON.
  • Turns OFF the headlamp (LO) when the ignition switch is placed turned OFF.
  • Headlamp (HI): OFF
  • Parking lamp
  • License plate lamp
  • Tail lamp
  • Side marker lamp
  • Illumination
  • Turns ON the tail lamp, parking lamp, license plate lamp, side marker lamp and each illumination when the ignition switch is placed ON.
  • Turns OFF the tail lamp, parking lamp, license plate lamp, side marker lamp and each illumination when the ignition switch is placed OFF.
Front wiper
  • The status just before activation of fail-safe control is maintained until the ignition switch is placed OFF while the front wiper is operating at LO or HI speed.
  • The wiper is operated at LO speed until the ignition switch is placed OFF if the fail-safe control is activated while the front wiper is set in the INT mode and the front wiper motor is operating.
Daytime running light Daytime running light: OFF
Front fog lamp Front fog lamp: OFF
Ignition relay The status just before activation of fail-safe is maintained.
Starter motor Starter relay: OFF

IGNITION RELAY CONTROL 

Voltage judgement IPDM E/R judgement Operation
Ignition relay contact side Ignition relay control condition
ON ON Ignition relay ON normal -
OFF OFF Ignition relay OFF normal -
ON OFF Ignition relay ON stuck Detects DTC [B20DD-73: IGN RELAY ON CIRC]
OFF ON Ignition relay OFF stuck Detects DTC [B20DE-72: IGN RELAY OFF CIRC]

FRONT WIPER CONTROL 

IPDM E/R detects front wiper stop position by front wiper stop position signal. When front wiper stop position signal is in the condition listed below while the front wiper is operating, IPDM E/R activates the fail-safe.

Ignition switch Front wiper switch Front wiper stop position signal Fail-safe
ON OFF The signal does not change from the battery voltage for 10 seconds. Stops front wiper power supply for 20 seconds
Except OFF The signal does not change for 10 seconds.
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