Nissan Maxima Service and Repair Manual: System description

  • Headlamp
  • System Diagram System Description Control of the headlamp system operation is dependent upon the position of the combination switch (lighting and turn signal switch). When the lighting switch is placed in the 2nd position, the BCM (body control module) receives input requesting the headlamps and park lamps to illuminate. This input is communicated to the IPDM E/R (intelligent power distribution module engine room) across the CAN communication lines. The CPU (central processing unit) of the IPDM E/R controls the headlamp high and headlamp low relay coils. When energized, these relays direct power to the respective headlamps, which then illuminate.

  • Daytime running light system
  • System Diagram System Description The headlamp system for Canada vehicles is equipped with a daytime light relay that activates the high beam headlamps at approximately half illumination whenever the engine is running. If the parking brake is depressed before the engine is started, the daytime lights will not be illuminated. The daytime lights will illuminate once the parking brake is released. Thereafter, the daytime lights will continue to operate when the parking brake is depressed.

  • Auto light system
  • System Diagram System Description BCM (Body Control Module) controls auto light operation according to signals from optical sensor, lighting switch and ignition switch. IPDM E/R (Intelligent Power Distribution Module Engine Room) operates parking, license plate, tail, front fog lamps and headlamps according to CAN communication signals from BCM. Optical sensor detects ambient brightness of 800 to 2,500 lux, converts light (lux) to voltage, and then sends the optical sensor signal to BCM. OUTLINE The auto light control system has an optical sensor that detects outside brightness.

  • Front fog lamp
  • System Diagram System Description BCM (Body Control Module) controls front fog lamp operation. IPDM E/R (Intelligent Power Distribution Module Engine Room) operates front fog lamp according to CAN communication signals from BCM. Combination meter operates front fog lamp indicator according to inputs via the CAN communication lines.

  • Turn signal and hazard warning lamps
  • System Diagram System Description BCM (Body Control Module) controls turn signal lamp (RH and LH) and hazard warning lamp operation Combination meter operates turn signal indicator (RH and LH) according to CAN communication signals from BCM. Component Parts Location BCM M16, M17, M18, M19 (view with combination meter removed) Combination switch (lighting and turn signal switch) M28 Combination meter M24 Hazard switch M54 Component Description TURN SIGNAL OPERATION When the turn signal switch is in LH or RH position with the ignition switch in ON position, the BCM detects the TURN RH or TURN LH ON request. The BCM outputs the flasher output signal to the respective turn signal lamp.

  • Parking, license plate and tail lamps
  • System Diagram System Description BCM (Body Control Module) controls parking, license plate and tail lamps operation. IPDM E/R (Intelligent Power Distribution Module Engine Room) operates parking, license plate and tail lamps according to CAN communication signals from BCM. Component Parts Location IPDM E/R E17, E18, E201 BCM M16, M17, M18, M19 (view with combination meter removed) Combination switch (lighting and turn signal switch) M28 Combination Meter M24 Component Description PARKING, LICENSE PLATE AND TAIL LAMPS OPERATION When the lighting switch is in 1ST position, BCM detects the LIGHTING SWITCH 1ST POSITION ON.

  • Combination switch reading system
  • System Diagram System Description OUTLINE BCM reads the status of the combination switch (light, turn signal, wiper and washer) and recognizes the status of each switch. BCM has a combination of 5 output terminals (OUTPUT 1 - 5) and 5 input terminals (INPUT 1 - 5) and reads a maximum of 20 switch states. COMBINATION SWITCH MATRIX Combination switch INPUT-OUTPUT system list COMBINATION SWITCH READING FUNCTION Description BCM reads the status of the combination switch at 10ms intervals normally. NOTE: BCM reads the status of the combination switch at 60ms intervals when BCM is controlled at low power consumption mode. BCM operates as follows and judges the status of the combination switch.

  • Diagnosis system (BCM)
  • COMMON ITEM COMMON ITEM : CONSULT Function (BCM - COMMON ITEM) APPLICATION ITEM CONSULT performs the following functions via CAN communication with BCM. SYSTEM APPLICATION BCM can perform the following functions.

  • Diagnosis system (ipdm E/R)
  • Diagnosis Description AUTO ACTIVE TEST Description In auto active test mode, the IPDM E/R sends a drive signal to the following systems to check their operation. Oil pressure warning lamp Front wiper (LO, HI) Parking lamps Side marker lamps License plate lamps Tail lamps Front fog lamps (if equipped) Headlamps (LO, HI) A/C compressor (magnet clutch) Cooling fans Operation Procedure Close the hood and lift the wiper arms from the windshield. (Prevent windshield damage due to wiper operation) NOTE: When auto active test is performed with hood opened, sprinkle water on windshield beforehand. Turn ignition switch OFF.

Basic inspection

Headlamp