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How to replace micro-relays - 2000 Chevrolet Malibu

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    yadayada Nov 14, 2010

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  • Chevrolet Master
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Just pull them out from fuse box. thats it!!

Posted on Nov 23, 2010

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How do I find out if the wipers on my 2006 H3 Hummeris on a relay?

The Wiper/Washer System consists of the following components:
• Windshield wiper/washer switch
• Body control module (BCM)
• Wiper micro relay
• Wiper 2 relay
• Wiper diode
• Windshield wiper motor
• Windshield washer pump
• Windshield washer nozzles
• Windshield washer solvent container
• Windshield wiper arm and blade assemblies
• Windshield wiper transmission
• WIP/WASH 10A fuse
• WIPER 25A fuse

Wiper/Washer System Description
The body control module (BCM) controls wiper motor low speed operation. The washer pump and high speed operation are controlled directly by the wiper/washer switch. The windshield wiper/washer switch supplies voltage on the signal circuits to the BCM for windshield wiper/washer operation. When WASH, MIST, DELAY, LOW, or HIGH is detected, the BCM energizes the wiper micro relay by suppling voltage to the relay coil. This allows battery voltage from the WIPER fuse to flow through the relay switched input then through the contacts and out the relay switched output to the wiper 2 relay switch contacts. Since the wiper 2 relay switch contacts are normally closed to the low speed circuit of the windshield wiper motor, the motor will operate at low speed.

Low Speed Operation
When the wiper switch is in the Low position, voltage is supplied through an internal resistor to the signal circuit. The body control module (BCM) monitors the windshield wiper switch signal 1 circuit, and energizes the wiper micro relay which will operate the windshield wiper motor. The wiper motor will operate at low speed, since the wiper 2 relay is de-energized. Low speed can also be commanded with a scan tool, by commanding Wiper Relay Cmd. ON and OFF. Refer to Scan Tool Output Controls .
High Speed Operation
In the High position, the windshield wiper/washer switch supplies voltage to both the wiper micro relay and wiper 2 relay coils. This energizes both relays and allows battery voltage from the wiper micro relay switched output to the switched input of the wiper 2 relay through its contacts and out the switched output of the wiper 2 relay to the high speed circuit of the windshield wiper motor. The windshield wiper motor will operate at high speed. During high speed wiper motor operation the wiper switch signal circuit is at the low speed signal voltage, and the body control module (BCM) supplies redundant voltage to the wiper relay via the wiper diode.

This info is out of hummer factory service manual !

Dec 10, 2016 | 2006 Hummer H3

1 Answer

Why did my wipers on my 2006 H3 Hummer quit?

This is a complex wiper circuit ! The place to start would be to check for DTC'S - diagnostic trouble code's .
DTC B3715, B3716, B3717, B3718, or B3719
The body control module (BCM) controls and monitors the state of the ON/OFF wiper relay control circuit. When the windshield wiper switch is placed in to a low speed setting, a signal is applied to the BCM. The BCM then applies battery positive voltage to the coil side of the ON/OFF WPR relay through the relay control circuit. This energizes the relay, allowing battery positive voltage from the FRT/WPR fuse through the switched side of the ON/OFF WPR relay through the HI/LOW WPR relay and to the windshield wiper motor. Ground is applied at all times to the coil sides of the wiper relays and the windshield wiper motor from G105.
• DTC B3717, the BCM detects a low voltage level on the supply circuit of the wiper micro relay for 1 second when the relay is energized.
• DTC B3718, the BCM detects a high voltage level on the supply circuit of the wiper micro relay for 1 second when the relay is de-energized
Your best bet mite be to take your vehicle to a qualified repair shop !

Dec 10, 2016 | 2006 Hummer H3

1 Answer

How to replace check horn relay for 2000 chevy malibu

The horn micro relay is in underhood fuse box, number 21 in the circle. Your owners manual should have this info. If you don't have an owners manual, you can look at one for free,
It'll ask for year--make model. The relay might not be the problem?

Nov 08, 2016 | 2000 Chevrolet Malibu

1 Answer

Ac fan stopped working

check the freon charge

Sep 05, 2012 | 2000 Pontiac Bonneville

1 Answer

Is there a fuse or relay or micro relay for the CHMSL on 98 sts

check the lt blue wire at upper lamp,(under trunk lid trim panel) for 12 volts when brake is applied. if no voltage,check same color wire at brake lamp switch for voltage.(by brake pedal).if no voltage replace stop lamp switch asm. if voltage is detected at rear by lamp then replace CHMSL asm.(center high mount stop lamp). this lamp is made of many LED's,if some work and some don't you will need to replace lamp asm. can be repaired by a trained GM tech, possibly. there is no seperate fuse or relay for this lamp,only a stop lamp fuse.

Nov 12, 2011 | 1998 Cadillac Seville

2 Answers

The horn in my 1999 Pontiac Grand Am GT dues not wrok how do i fix it and get to it thank you Michelle

check the relay and fuse first. it is in underhood fuse box on drivers side. the fuse is # 43 and its a mini fuse. the relay is # 21 and its a micro relay. to access horn remove right front headlight housing. on top of headlight housing there are 2 plastic slide pins. just pull them up to release housing. then look down to horn. when putting housing back on just push in on housing and push pins back down. have a good one !!

Feb 25, 2011 | Pontiac Grand Am Cars & Trucks

1 Answer

Where is the a/c relay located on a 2003 Ford Ranger Edge; 3.0L engine V6?

witch relay? low pressure relay? micro relay? low pressure relay is in a/c line near passenger firewall I don't know what you'r a/c is doing hope this helps CJ

May 20, 2010 | Cars & Trucks

2 Answers

I have a 2003 Ford Escape V6 3.0L. Where is located the transmission relay. I think it is called Mini ISO Relay.

Mini ISO Relay is a TYPE of relay. Your vehicle uses 2 types of relays; Mini ISO Releays and Micro ISO Relays. They are located in several locations throughout the vehicle. I do not know what you mean by "Transmission Relay" What, exactly, are you trying to fix?

Nov 21, 2009 | Ford Escape Cars & Trucks

1 Answer

2001 chevy malibu started nite before next morn engine turned ove

there is a a/c relay in under hood fuse bx, check this it may be bad. check micro relay it is # 16, it is for the a/c compressor. in fuse box under hood.

Jul 11, 2009 | 2001 Chevrolet Malibu

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