Sub-Systems

FRONT WIPER AND WASHER SYSTEM

System Description
- Both front wiper relays are located in the IPDM E/R (intelligent power distribution module engine room)
- Wiper switch (combination switch) is composed of a combination of 5 output terminals and 5 input terminals. Terminal combination status is read by BCM (body control module)
- BCM controls front wiper LO, HI, and INT (intermittent) operation
- IPDM E/R operates the wiper motor according to CAN communication signals from the BCM.

Power is supplied at all times
- through 50 A fusible link (letter f , located in the fuse and fusible link box)
- to BCM terminal 70, and
- through 20 A fuse (No. 39, located in the IPDM E/R)
- to front wiper relay, located in the IPDM E/R

With the ignition switch in ON or START position, power is supplied at all times
- through 10 A fuse [No. 1, located in the fuse block (J/B)]
- to BCM terminal 38, and
- to ignition relay, located in the IPDM E/R, and
- through 10 A fuse (No. 47, located in the IPDM E/R)
- through IPDM E/R terminal 44
- to front washer motor terminal 1.

Ground is supplied
- to BCM terminal 67 and
- to combination switch terminal 9
- through grounds F14, M57 and M61, and
- to IPDM E/R terminals 38 and 60 and
- to front wiper motor terminal E
- through grounds E15 and E24.

LOW SPEED WIPER OPERATION
When the ignition switch is in the ON or START position and the front wiper switch is turned to low position, the BCM detects a low speed wiper ON signal by BCM wiper switch reading function.

BCM then sends front wiper (low) request signal over CAN communication lines
- from BCM terminals 39 and 40
- to IPDM E/R terminals 48 and 49.

When IPDM E/R receives front wiper (low) request signal, it supplies ground to energize the front wiper relay. With the front wiper relay energized, power is supplied
- through front wiper relay
- to front wiper HI relay
- through IPDM E/R terminal 21
- to front wiper motor terminal L.

With power and ground supplied, the front wiper motor operates at low speed.

HI SPEED WIPER OPERATION
When the ignition switch is in the ON or START position and the front wiper switch is turned to high position, the BCM detects a high speed wiper ON signal by BCM wiper switch reading function.

BCM then sends front wiper (high) request signal over CAN communication lines
- from BCM terminals 39 and 40
- to IPDM E/R terminals 48 and 49.

When IPDM E/R receives front wiper (high) request signal, it supplies ground to energize the front wiper and the front wiper HI relays.

With the front wiper and the front wiper HI relays energized, power is supplied
- through front wiper relay
- to front wiper HI relay
- through IPDM E/R terminal 31
- to front wiper motor terminal H.

With power and ground supplied, the front wiper motor operates at high speed.

INTERMITTENT OPERATION
Wiper intermittent operation delay interval is determined from the combination of the intermittent wiper dial position inputs and vehicle speed. During each intermittent operation delay interval, the BCM sends a front wiper request signal to the IPDM E/R to operate the wipers.

When the ignition switch is in ON or START position and the front wiper switch is turned to intermittent position, the BCM detects a front wiper (intermittent) ON signal by BCM wiper switch reading function.

BCM then sends front wiper (intermittent) request signal over CAN communication lines
- from BCM terminals 39 and 40
- to IPDM E/R terminals 48 and 49.

When BCM determines that combination switch status is front wiper intermittent ON, it performs the following operations.
- BCM detects ON/OFF status of intermittent wiper dial position
- BCM calculates operation interval from wiper dial position and vehicle speed signal received through CAN communications
- BCM sends front wiper request signal (INT) to IPDM E/R at calculated operation interval.

When IPDM E/R receives front wiper request signal (INT), it supplies ground to energize the front wiper relay. It then sends auto-stop signal to BCM and conducts intermittent front wiper motor operation.

AUTO STOP OPERATION
When the wiper arms are not located at the base of the windshield and the wiper switch is turned OFF, the wiper motor will continue to operate until the wiper arms reach windshield base. When wiper arms reach base of windshield, front wiper motor terminals E and P are connected.

Ground is supplied
- to IPDM E/R terminal 32
- through front wiper motor terminal P
- through front wiper motor terminal E
- through grounds E15 and E24.

The IPDM E/R sends auto stop operation signal to BCM through CAN communication lines.

When BCM receives auto stop operation signal, BCM sends wiper stop signal to IPDM E/R with CAN communication lines. The IPDM E/R then de-energizes the front wiper relay.

Wiper motor will then stop wiper arms at the STOP position.

WASHER OPERATION
When wiper switch is in front wiper washer position, BCM detects front wiper washer signal by BCM wiper switch reading function. Refer to "COMBINATION SWITCH READING FUNCTION" .

When front wiper switch is turned to washer position, ground is supplied
- to front washer motor terminal 2
- through combination switch terminal 3
- through combination switch terminal 9
- through grounds F14, M57 and M61.

With ground supplied, the front washer motor is operated.
When BCM detects that front washer motor has operated for 0.4 seconds or longer, BCM uses CAN communication and sends wiper request signal to IPDM E/R for low speed operation of wipers.

When BCM detects that washer switch is OFF, low speed operation cycles approximately 3 times and then stops.

MIST OPERATION
When the wiper switch is temporarily placed in the mist position, wiper low speed operation cycles once and then stops.

For additional information about wiper operation under this condition, refer to "LOW SPEED WIPER OPERATION" .

If the switch is held in the mist position, low speed operation continues.

FAIL-SAFE FUNCTION
BCM includes fail-safe function to prevent malfunction of electrical components controlled by CAN communications if a malfunction in CAN communications occurs.

BCM uses CAN communications to stop output of electrical components it controls.

Until ignition switch is turned off, front wiper remains in same status as just before fail-safe control was initiated. (If wiper was in low speed operation just before fail-safe, it continues low speed operation until ignition switch is turned OFF.) When fail-safe status is initiated, BCM remains in standby until normal signals are received.

When normal signals are received, fail-safe status is canceled.

CAN Communication System Description
Refer to "Information Bus".