Fog/Driving Lamp: Description and Operation

System Description
Control of the fog lamps is dependent upon the position of the combination switch (lighting switch). The lighting switch must be in the 2ND position or AUTO position (headlamp is ON) for front fog lamp operation.When L the lighting switch is placed in fog lamp position the BCM (body control module) receives input signal requesting the fog lamps to illuminate. When the headlamps are illuminated, this input signal is communicated to the IPDM E/R (intelligent power distribution module engine room) across the CAN communication lines. The CPU (central processing unit) located in the IPDM E/R controls the front fog lamp relay coil. When activated, this relay directs power to the front fog lamps.

OUTLINE

Power is supplied at all times
- to ignition relay, located in IPDM E/R, from battery direct,
- through 15 A fuse (No. 88, located in IPDM E/R)
- to front fog lamp relay, located in IPDM E/R,
- through 15 A fuse (No. 78, located in IPDM E/R)
- to CPU located in IPDM E/R,
- through 10 A fuse (No. 71, located in IPDM E/R)
- to CPU located in IPDM E/R,
- through 50 A fusible link (letter F, located in fuse, fusible link and relay box)
- to BCM terminal 55,
- through 10 A fuse [No. 18, located in fuse block (J/B)]
- to BCM terminal 42.

When ignition switch is in ON or START position, power is supplied
- to ignition relay, located in IPDM E/R, from battery direct,
- through ignition relay, located in IPDM E/R
- to CPU located in IPDM E/R,
- through 10 A fuse [No. 1, located in fuse block (J/B)]
- to BCM terminal 38.

When ignition switch is in ACC or ON position, power is supplied
- through 10 A fuse [No. 6, located in fuse block (J/B)]
- to BCM terminal 11.

Ground is supplied
- to BCM terminal 52
- through grounds M30 and M66,
- to IPDM E/R terminals 38 and 60
- through grounds E17 and E43.

FOG LAMP OPERATION (FOR USA)
The fog lamp switch is built in combination switch. The lighting switch must be in 2ND position or AUTO position (headlamp is ON) and fog lamp switch must be ON for fog lamp operation.

With the fog lamp switch in the ON position, CPU located in IPDM E/R grounds coil side of the fog lamp relay. Fog lamp relay then directs power
- through IPDM E/R terminal 37
- to front fog lamp LH terminal 1,
- through IPDM E/R terminal 36
- to front fog lamp RH terminal 1.

Ground is supplied
- to front fog lamp LH terminal 8
- through grounds E17 and E43,
- to front fog lamp RH terminal 8
- through grounds E17 and E43.

With power and grounds supplied, front fog lamps illuminate.

FOG LAMP OPERATION (FOR CANADA)
The fog lamp switch is built in combination switch. The lighting switch must be in 2ND position or AUTO position (headlamp is ON) and fog lamp switch must be ON for fog lamp operation.

With the fog lamp switch in the ON position, CPU located in IPDM E/R grounds coil side of the fog lamp relay. Fog lamp relay then directs power
- through IPDM E/R terminal 37
- to daytime light relay-1 terminals 2 and 5
- through daytime light relay-1 terminal 3
- to front combination lamp LH terminal 1,
- through IPDM E/R terminal 36
- to front combination lamp RH terminal 1.

Ground is supplied
- to daytime light relay-1 terminal 1
- through grounds E17 and E43,
- to front combination lamp LH terminal 8
- through daytime light control unit terminal 7
- through daytime light control unit terminal 9
- through grounds E17 and E43,
- to front combination lamp RH terminal 8
- through grounds E17 and E43.

With power and grounds supplied, front fog lamps illuminate.

COMBINATION SWITCH READING FUNCTION
Refer to Body Control System, "COMBINATION SWITCH READING FUNCTION".

EXTERIOR LAMP BATTERY SAVER CONTROL
When combination switch (lighting switch) is in the 2ND position (ON), fog lamp switch is ON, and ignition switch is turned from ON or ACC to OFF, the battery saver control feature is activated.

Under this condition, fog lamps (and headlamps) remain illuminated for 5 minutes, then fog lamps (and headlamps) are turned off.
Exterior lamp battery saver control mode can be changed by the function setting of CONSULT-II.

CAN Communication

System Description
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

CAN Communication Unit
Refer to Information Bus.