Question about 2003 Chevrolet Suburban 1500

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2003 Suburban - "Service Brake Booster" and "Battery Not Charging" on trip computer display area

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  • dcook109 Feb 05, 2010

    2003 Suburban, getting 2 separate indicators on the trip computer line, "Service Brake Booster" and "Battery Not Charging"

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2 Answers

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  • Master
  • 3,489 Answers

First check your power steering fluid. the system that this truck uses is called hydro boost and is fed hydraulically through the power steering pump. if it is low on fluid, it will have an affect on the ease of the brake pedal. the other youre going to need to have your charging system tested if you havent already. if you have what were the results?

Posted on Feb 05, 2010

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  • Chevrolet Master
  • 17,970 Answers

I find this about this problem... This is what they do: Document ID# 1633606 (other Bulletins) ABS Light On, DTCs C0265, C0201, U1041 Set and/or Loss of Communication with Brake Module (Reground EBCM Ground) #04-05-25-002B - (Mar 23, 2005) 2004-2005 Buick Rainier 2002-2005 Cadillac Escalade, Escalade EXT 2003-2005 Cadillac Escalade ESV 1999-2005 Chevrolet Silverado 2000-2005 Chevrolet Suburban, Tahoe 2002-2005 Chevrolet Avalanche, TrailBlazer, TrailBlazer EXT 2003-2005 Chevolet SSR 1999-2005 GMC Sierra 2000-2005 GMC Yukon, Yukon Denali, Yukon XL 2002-2005 GMC Envoy, Envoy XL, Sierra Denali 2004-2005 GMC Envoy XUV 2002-2004 Oldsmobile Bravada This bulletin is being revised to update the parts information and add 2005 model year vehicles. Please discard Corporate Bulletin Number 04-05-25-002A (Section 05 -- Brakes). Condition Some customers may comment that the ABS light is on. Upon further inspection, DTCs C0265 and C0201 may be set in the brake module. It is also possible for DTC U1041 to set in other modules. There may also be a loss of communication with the brake module. Cause A poor connection at the EBCM ground is causing unnecessary replacements of brake modules. Important: The EBCM Ground is different for each application. Refer to the list below for the proper ground reference: ? Midsize Utilities = Ground 304 ? SSR = Ground 400 ? Fullsize Trucks and Utilities = Ground 110 Correction DO NOT REPLACE THE BRAKE MODULE. Perform the following steps to improve the connection of the EBCM Ground: 1. Remove the EBCM Ground. The EBCM Ground is located on the frame beneath the driver's side door. If multiple grounds are found in this location, the EBCM ground can be identified as the heavy (12-gauge) wire. 2. Clean the area, front and back, using a Whiz Wheel®. 3. Install the ground, then the washer and then the bolt to the frame. Important: It is important to use the bolts, washers and nuts specified in this bulletin. These parts have been identified due to their conductive finish. 4. Install a washer and nut to the backside of the frame. Tighten: Tighten the nut to 9 N·m (79 lb in). 5. Cover the front and back side of the repair area using Rubberized Undercoating. Continues with dealer parts & labor info...

Posted on Feb 05, 2010

  • ZJ Limited
    ZJ Limited Feb 05, 2010

    So, if you have vacuum assist brakes there is a motor mounted on the
    booster. If the voltage gets too low the motor will not be able to
    operate so the message comes on warning you.

    About your 2nd problem, Battery no Charging, I think that the alternator is bad or you have a bad wire or powertrain control module. Never buy the house brand alternator from a chain store.

    Hope helps.



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1 Answer

Why does " service brake booster" light always on??


SERVICE BRAKE BOOSTER
Refer to Brake Warning System Description and Operation in Hydraulic Brakes

SERVICE BRAKE BOOSTER
The SERVICE BRAKE BOOSTER message will be displayed when the supplemental brake assist signal circuit is toggled at 1.0 Hz with a 50 percent duty cycle. This message is also displayed if the instrument panel cluster (IPC) does not see an alive and well signal at key on. When this message is displayed it indicates a problem with the SBA and should be serviced or replaced.

How do the power brakes work ? Good .?

Service Brake Booster Message Displayed
Step
Action
Yes
No
Schematic Reference: Brake Warning System Schematics
1
Did you review the Brake Warning System Description and Operation and the Brake Assist System Description and Operation and perform the necessary inspections?
YES - Go to Step 2
NO - Go to Symptoms - Hydraulic Brakes
2
Start the vehicle.
Is the REDUCED BRAKE POWER message displayed for 1 minute before the SERVICE BRAKE BOOSTER message is displayed?
YES - Go to Step 3
NO - Go to Step 4
3
Perform the Brake Assist System Diagnosis
Did you find and correct the condition?
YES - Go to Step 12
NO - Go to Step 11
4
Disconnect the Supplemental Brake Assist connector.
Test the ignition 1 circuit for an open or a short to ground.
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
YES - Go to Step 12
NO - Go to Step 5
5
Test both ground circuits for opens.
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
YES - Go to Step 12
NO - Go to Step 6
6
Test the engine on signal circuit for an open or a short to ground.
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
YES - Go to Step 12
NO - Go to Step 7
7
Test the vehicle speed signal circuit for an open.
Did you find and correct the condittion?
YES - Go to Step 12
NO - Go to Step 8
8
Test the supplemental brake assist signal circuit for an open or a short to voltage.
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
YES - Go to Step 12
NO - Go to Step 9
9
Connect the supplement brake assist connector.
Disconnect the instrument panel cluster connector.
Connect a DMM from battery positive voltage to the supplemental brake assist signal circuit.
Turn the ignition to the RUN position while observing the DMM.
Did the DMM flash battery voltage?
YES - Go to Step 11
NO - Go to Step 10
10
Replace the Supplemental Brake Assist pump motor assembly Refer to Power Brake Booster Auxiliary Pump Replacement .
Did you complete the replacement?
YES - Go to Step 12
--
11
Replace the instrument panel cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gages and Console.
Did you complete the replacement?
YES - Go to Step 12
--
12
Start the engine.
Does the Service Brake Booster message stay on?
Go to Step 2
System OK

Dec 25, 2016 | Cars & Trucks

1 Answer

Volt gauge reading low but still charging 14.2 volts


the low charge # @ gauge could be caused by bad ground or high resistence in the wireing harness. Don't think it has anything to do with your 4x shifting prob I would check 4x switch and electric motor on transfere case.

Dec 21, 2012 | 2003 Chevrolet Suburban 1500

1 Answer

Battery not charging/service brake booster


The brake booster uses vacuum from the engine to multiply the force that your foot applies to the master cylinder.
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car key programmers

Nov 14, 2012 | 2003 Chevrolet Silverado 1500

1 Answer

Dion5555@yahoo.com1995chev trk brake booster removal


Welcome to Fixya

Look underneath the dash and find the connection from the brake booster to the top of the brake pedal. Take off the clip that holds the pedal to the linkage with your hands. Unbolt the brake booster from the firewall with the 3/8-inch ratchet and socket.Unbolt the master cylinder from the booster with an open-end wrench. Pull the master cylinder off of the booster, then pull the vacuum line off of the brake booster. Take the booster away from the engine bay and discard it.Install the replacement booster onto the Suburban and bolt it in place with the 3/8-inch ratchet and socket. Reconnect the brake pedal to the brake booster with the factory clip.Mount the master cylinder on the booster with the open-end wrench and the factory bolts. Plug the vacuum line into the check valve on the replacement booster. Pump the brakes several times with your foot with the engine running to verify that the booster builds vacuum.
Thank you for using Fixya!

Jul 02, 2011 | 1995 Chevrolet Suburban

1 Answer

Battery not charging service brake booster


1.alternator is bad again 2. bad wire or powertrain control module. 3. avoid purchashing house brand alternator from an automotive store. 4. I've seen the house brands last as little as 6 months!!! *************.In vacuum assist brakes there is a motor mounted on the booster.If the voltage gets too low the motor will not be able to operate so the message appears warning you.************

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Jan 11, 2011 | 2003 Chevrolet Suburban 1500

2 Answers

Chevy Suburban 1500 -- Battery Not Charging Light....Replaced Alternator....Still had battery not charging light....Replaced battery....Still have battery not charging light...also first time seen service...


Make sure that you buy a 'lifetime' warranted alternator from your parts source to avoid problems with bad alternators out of the box. I would try to return and exchange the alternator with one that tests out ok on a bench, in order to verify if the wiring in between the alternator or the alternator itself was bad.

Service brake booster would have to do with the vacuum or power booster problem around the master cylinder for the braking system. That wouldn't have anything to do with the alternator, I do not believe.

Good luck on these repairs.

Jan 08, 2011 | 2003 Chevrolet Suburban 1500

1 Answer

Started my 2003 Chevrolet Tahoe this afternoon and the battery started flashing, dash said battery not charging, then brakes started messing up (felt like they were puslating)..dash then read battery not...


check ue alternator to see if its charging ur battery to check this start car and disconnect pos cable from battery if it shuts off its ur alternator

Feb 27, 2010 | 2003 Chevrolet Tahoe

1 Answer

1999 Suburban Chevy, Every time I press the brake pedel I can hear air comming from the rubber boot inside the cab. Is the brake booster gone/going bad?


Usually, a hissing noise when you press the brake pedal is indicative of a leaking brake booster, yes.

While sitting still, idling, have someone else push the brake and grab a piece of garden hose or something, hold it to your ear, and listen up under the dash to find out if the noise is actually coming from that area, or you could also just pinch the line with a pair of vice grips, and see if you still hear the noise.

Your brakes will not cease to function as a result of a booster leak, but if it fails completely, they will become substantially more difficult to use.

Dec 31, 2009 | 1999 Chevrolet Suburban

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