Question about 1987 Volvo 240
Wipers only operate in fastest mode
I have seen a simular fault which ended up being the intermittent wiper relay was full of water from water collected in the airconditoners evaporator tray.
The water has problems escaping this tray & when you go around the corners the water rans out onto your feet & the intermittent wiper relay is mounted down the side of the transmission wall & gets soaked along with the carpet.
I suggest you find the relay, remove it check the inside of it for water damage. If stuffed replace it & also suggest to check your evaporator's tray & rubber S bend drain for obstructions. I think this is a design fault in all 240s.
Another fault I have seen with the wiper motor is it not running too well with excessive noise, due to water getting into the motor through the 2 mounting clips on the round part of the motor casing to the casting. There are 2 small slots which allows water into the motor.
I suggest remove the wiper motor by removing the cir clip & or nut under the dash board connecting to the arms, Then the 3 x 10mm bolts & carefully pull the wiper motor apart don't loose the 2 angled clips & screws, clean & re grease the motor & try not to damage the maganets or over tighten the 2 screws & re assemble in reverse order.
Posted on Jul 22, 2008
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Jul 20, 2016 | 2006 Mercury Grand Marquis
Body control module (BCM)
Wiper 1 relay
Wiper 2 relay
Windshield wiper motor
Windshield washer pump
Windshield washer nozzles
Windshield washer solvent container
Windshield wiper arm and blade assemblies
Windshield wiper transmission
WIPER/SW 10A fuse
WIPER 25A fuse
The body control module (BCM) controls the wiper motor based on input from the windshield wiper washer switch. The BCM monitors the wiper washer switch through three separate signal circuits and a ground circuit. The windshield wiper switch high signal circuit is used to determine high speed wiper operation, the windshield wiper switch low signal is used to determine low speed, intermittent, and mist operation through the use of a resistor ladder, and windshield washer switch signal circuit is used to determine washer operation. The windshield wiper motor park operation is controlled by the BCM. The BCM recieves an input from the park switch to determine wiper blade position. When the wiper blades are at the bottom of the windshield glass in park position the wiper park switch will open and the circuit will be pulled up to B+ by the BCM. The park signal will be pulled to ground by the wiper motor park switch while the wiper blades are not in the park position.
The BCM controls the windshield wiper motor through two output controls, controlling two relays which determine the desired wiper speed, high or low
Diagnostic Trouble Codes (DTCs)
The body control module (BCM) monitors the voltage on the windshield wiper switch signal 2 circuit for diagnostic purposes. If the circuit is shorted to voltage while the driver is commanded OFF, the BCM will store DTC B3715. If the circuit is shorted to ground while the driver is commanded ON, the BCM will store DTC B3715. Refer to DTC B3715.
It would be best to have a factory scan tool to diagnose this problem . it would make it easier anyway .
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