Rear

REAR WIPER AND WASHER SYSTEM

System Description
- The wiper switch (combination switch) is composed of a combination of 5 output terminals and 5 input terminals.
Terminal combination status is read by the BCM (body control module) when switch is turned ON.
- The BCM controls rear wiper ON and INT (intermittent) operation.

Power is supplied at all times
- through 50 A fusible link (letter f, located in fusible link box)
- to BCM terminal 70.

With the ignition switch in ON or START position, power is supplied
- through 10 A fuse [No. 9, located in fuse block (J/B)]
- to combination switch terminal 14, and
- through 10 A fuse (No. 59, located in the fuse and relay box)
- to BCM terminal 38.

Ground is supplied
- to BCM terminal 67 and
- to combination switch terminal 12
- through grounds M57, M61 and M79.

REAR WIPER OPERATION
When the ignition switch is in the ON or START position, and the rear wiper switch is in the ON position, the BCM detects a rear wiper ON request through the combination switch (wiper switch) reading function.

The BCM will first check the status of the glass hatch ajar switch before supplying power to the rear wiper motor. If the glass hatch ajar switch is closed (ground) the BCM will not turn on the rear wiper motor. If the glass hatch ajar switch is open (not grounded) the BCM will control the rear wiper motor as follows.

The BCM controls rear wiper motor operation by switching direction of current flow between the two rear wiper motor output circuits.

Power is supplied to output circuit 1 for forward operation (counterclockwise sweep),
- through BCM terminal 55
- to rear wiper motor terminal 4.

Ground is supplied
- to rear wiper motor terminal 6
- through BCM terminal 54
- through BCM terminal 67
- through grounds M57, M61 and M79.

With output circuit 1 power and ground supplied, the rear wiper motor operates in a counterclockwise sweep direction until auto stop switch 1 closes (full sweep position). Auto stop switch 1 supplies ground
- to BCM terminal 44
- through rear wiper motor terminal 2
- through rear wiper motor terminal 5
- through grounds B117 and B132.

When the BCM receives this ground signal it turns off output circuit 1 and turns on output circuit 2.
Power is supplied to output circuit 2 for reverse operation (clockwise sweep),
- through BCM terminal 54
- to rear wiper motor terminal 6.

Ground is supplied
- to rear wiper motor terminal 4
- through BCM terminal 55
- through BCM terminal 67
- through grounds M57, M61 and M79.

With output circuit 2 power and ground supplied the rear wiper motor operates in a clockwise sweep direction until auto stop switch 2 closes (full sweep position). Auto stop switch 2 supplies ground
- to BCM terminal 26
- through rear wiper motor terminal 1
- through rear wiper motor terminal 3
- through grounds B117 and B132.

When the BCM receives this ground signal it turns off output circuit 2 and turns on output circuit 1. This process repeats until the rear wiper switch or ignition switch is turned off.

If the ignition switch is turned to OFF during operation, the rear wiper motor will immediately stop. If the ignition switch is turned ON after this condition, and the BCM does not receive a rear wiper switch ON or INT signal, the BCM will operate the rear wiper to the auto stop position.

If the BCM does not receive a change in status in either auto stop switch 1 or auto stop switch 2 within a 5 second period of output circuit 1 or output circuit 2 operation, the BCM will turn off output circuit 1 and output circuit 2.

If the BCM detects the rear door glass ajar signal during rear wiper motor operation, the BCM will operate the rear wiper motor to the auto stop position. Once the rear door glass ajar signal returns to open (not grounded) for 5 or more seconds, the BCM will resume rear wiper motor operation.

INTERMITTENT OPERATION
The rear wiper motor operates the wiper arm at low speed approximately every 7 seconds.
When the wiper switch is in the rear wiper INT position, the BCM detects a rear wiper INT request through the combination switch (wiper switch) reading function.

The BCM controls rear wiper motor operation by switching direction of current flow between the two rear wiper motor output circuits.
Power is supplied to output circuit 1 for forward operation (counterclockwise sweep),
- through BCM terminal 55
- to rear wiper motor terminal 4.

Ground is supplied
- to rear wiper motor terminal 6
- through BCM terminal 54
- through BCM terminal 67
- through grounds M57, M61 and M79.

With output circuit 1 power and ground supplied, the rear wiper motor operates in a counterclockwise sweep direction until auto stop switch 1 closes (full sweep position). Auto stop switch 1 supplies ground
- to BCM terminal 44
- through rear wiper motor terminal 2
- through rear wiper motor terminal 5
- through grounds B117 and B132.

When the BCM receives this ground signal it turns off output circuit 1 and turns on output circuit 2.
Power is supplied to output circuit 2 for reverse operation (clockwise sweep),
- through BCM terminal 54
- to rear wiper motor terminal 6.

Ground is supplied
- to rear wiper motor terminal 4
- through BCM terminal 55
- through BCM terminal 67
- through grounds M57, M61 and M79.

With output circuit 2 power and ground supplied the rear wiper motor operates in a clockwise sweep direction until auto stop switch 2 closes (full sweep position). Auto stop switch 2 supplies ground
- to BCM terminal 26
- through rear wiper motor terminal 1
- through rear wiper motor terminal 3
- through grounds B117 and B132.

When the BCM receives this ground signal it turns off output circuit 2 and starts the timing function of 7 seconds. After approximately 7 seconds the BCM turns on output circuit 1. This process repeats until the rear wiper switch or ignition switch is turned off.

AUTO STOP OPERATION
When the rear wiper switch is turned off, the BCM will continue the cycle of output circuit 1 or output circuit 2 until auto stop switch 1 and auto stop switch 2 are both in the closed position. When the BCM receives ground signals from auto stop switch 1 and auto stop switch 2 simultaneously, output circuit 1 and output circuit 2 are both turned off.

REAR WASHER OPERATION
When the ignition switch is in the ON or START position, and the front and rear washer switches are OFF, the front and rear washer motor is supplied power
- through 10 A fuse (No. 9, located in the fuse block J/B)
- through combination switch (wiper switch) terminal 14
- through combination switch (wiper switch) terminal 11
- to front and rear washer motor terminal 2, and
- through combination switch (wiper switch) terminal 13
- to front and rear washer motor terminal 1.

When the rear wiper switch is in rear washer position, the BCM detects a rear washer signal by BCM wiper switch reading function. Combination switch ground is supplied
- to front and rear washer motor terminal 1
- through combination switch (wiper switch) terminal 13
- through combination switch (wiper switch) terminal 12
- through grounds M57, M61 and M79.

With ground supplied, the front and rear washer motor is operated in the rear direction.
When the BCM detects that the rear washer motor has operated for 0.4 seconds or longer, BCM operates the rear wiper motor.

When the BCM detects that the rear washer switch is in OFF, the rear wiper motor cycles approximately 3 times and then stops.

If the rear washer is operated with the rear wiper switch in the INT position, normal rear wiper operation will take over. Once the rear washer switch is released the rear wiper will return to INT operation.

BCM WIPER SWITCH READING FUNCTION
Refer to "COMBINATION SWITCH READING FUNCTION".