Question about Chevrolet Silverado 1500

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What is the CTSY Fuse? And why do I have a voltage drain in this circuit?

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  • eliecer Aug 28, 2013

    that function has this fuse

  • eliecer Aug 28, 2013

    thanks

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  • Chevrolet Master
  • 2,002 Answers

CTSY is the courtesy lamps, the lights that come on when you open the door. You have a drain because something on that circuit is not turning off or a wire may be rubbed bare. Start checking by removing the bulbs from the sockets to see if that kills the drain. If there is a light in the trunk or under the hood remove those too. This should stop the drain. Then replace them one at a time to see which one is the culprit. When you replace the hood and trunk ones make sure the lids are closed when you test. Otherwise you are looking for a chaffed wire somewhere. Hope this helps.

Posted on Sep 08, 2010

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  • Master
  • 518 Answers

It runs your dome light,glovebox light etc. One of these is staying on & causing a draw & drain on your battery after the key is off.

Posted on Sep 08, 2010

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1 Answer

Dome light switch is in right position and dome lights still do not come on. Is there a relay for control? on 2011 chevrolet silverado.


No relay , the BCM supply's power . BCM - body control module .
The interior lighting consists of 2 groups. The first group includes lamps that may not be dimmed.
• Courtesy/illuminated entry lamps
• Dome lamps
• Map lamps
• Reading lamps
• Vanity mirror lamps

Dome/Interior Lamp Switch Malfunction
Ignition OFF, disconnect the harness connector at the headlamp switch.
Test for less than 5 ohms between the ground circuit terminal 8 and ground.
? If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify the scan tool Ctsy. Lamp Actv. Reason parameter is Off.
? If the scan tool parameter is Manual or Manual Defeat, test the appropriate signal circuit terminals for a short to ground. If the circuit tests normal, replace the BCM.
• Manual terminal 12
• Manual Defeat terminal 9
Install a 3A fused jumper wire between the signal circuit terminal 12 and the ground circuit terminal 8. Verify the scan tool Ctsy. Lamp Actv. Reason parameter is Manual.
? If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
Install a 3A fused jumper wire between the signal circuit terminal 9 and the ground circuit terminal 8. Verify the scan tool Ctsy. Lamp Actv. Reason parameter is Manual Defeat.
? If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
If all circuits test normal, test or replace the headlamp switch.

Your best bet mite be to take to a qualified repair shop .

Aug 23, 2017 | Chevrolet Cars & Trucks

1 Answer

I have a 2007 Buick Lucerne and the front reading lamps won't turn off.


Overhead Console Lamp and Roof Rail Courtesy/Reading Lamps
The courtesy/reading lamp is a duel purpose lamp that can be illuminated two different ways. First, the lamp can be turned ON during courtesy lamp operation as described above. Second, the lamps can be turned ON individually for reading lamp operation by the lamp switch. The BCM supplies battery voltage from the INT LAMPS fuse through the inadvertent power courtesy lamps circuit to the courtesy/reading lamps for reading lamp operation only. Ground for the courtesy lamp module or the roof/rail reading lamps is provided at G402

Courtesy Lamps
When either one of the front doors is opened, ground is applied through the door latch door open switch and the door open switch signal circuit to the door module indicting the door open position. In response to this signal, the door module sends a GMLAN serial data message to the BCM of the door open position. Or, when either one of the rear doors is opened, ground is applied through the door latch door open switch and the rear door open switch signal circuit to the BCM is indicating the rear door open position. Once a door open message or signal received, the BCM will then apply battery voltage from the CTSY/RF TRN fuse through the courtesy lamp supply voltage circuits illuminating the lamps listed below:
• Overhead console lamp
• Roof rail courtesy lamps
• Footwell courtesy lamps The BCM receives battery voltage from the INT LAMPS fuse in order to supply power to the inadvertent courtesy lamps. Inadvertent power courtesy lamp feature provides a similar function for the interior lamps as a retained accessory power feature. The BCM will energize the courtesy lamps supply voltage circuit when the BCM is in the active state (awake). When the inadvertent power courtesy lamps supply voltage circuit is energized, it supplies voltage to all the interior lights listed below. The BCM will continue to supply voltage to the interior lamps after the ignition is turned OFF so that the interior lamps may be operated.
• Overhead Console Reading Lamps
• Roof Rail Reading Lamps
• Vanity Mirror Lamps
• I/P Compartment Lamp
• Rear Compartment Courtesy Lamp
In the event that any of these lamps were to remain illuminated for a period of more than 20 minutes with the ignition switch in the OFF position and no BCM input activity, the BCM will deactivate the inadvertent power supply voltage circuit to prevent a total battery discharge condition. The BCM receives battery voltage from the CTSY/RF TRN fuse in order to supply power to the courtesy lamps. The BCM applies this voltage to the courtesy lamps through the courtesy lamp supply voltage circuits. When any door is opened, the door open switch contacts close and the BCM receives a door-open signal. If the BCM receives a door lock or unlock signal, the BCM will activate the courtesy lamp supply voltage circuit, providing battery voltage to the dome lamps and the left and right footwell courtesy lamps. The courtesy lamps can be manually activated by placing the interior lamp switch in the DOME position. For more detailed information concerning courtesy lamp operation refer to Interior Lighting Systems Description and Operation.

Jan 16, 2017 | Buick Cars & Trucks

1 Answer

Where is the location to replace overhead lights fuse in 2003 oldsmobile aurora


Rear fuse box. INT LP 10 amp . there is also INT LP relay in the same rear fuse box .
Fuse Block - Rear
Under the rear seat, on the left side of the floor pan
The INT LP fuse in the fuse block - rear supplies battery positive voltage to the normally open switch contacts of the INT LP relay. The INT LP fuse also supplies battery positive voltage to the INT LP relay control circuit. The fuse block - rear also supplies battery positive voltage to the relay control circuit for the front courtesy lamp. The door modules communicate on a simple bus interface (SBI). When you open any door, the switch contacts of the door open switch close. When a door open signal circuit is grounded, that door module sends a message to the drivers door module (DDM) in order to indicate that a door is open. The DDM sends a class 2 message to the rear integration module (RIM) in order to indicate which door is open. The RIM activates the INT LP relay in order to provide battery positive voltage to the interior courtesy lamps. When any front door is opened, the RIM will energize the FRT CTSY lamp relay grounding the I/Pcourtsey lamps at G302. Depending on which doors are opened, front or rear, the proper interior courtesy lamps illuminate. The RIM provides a pulse width modulated ground to all interior courtesy lamps for the interior lights theater dimming feature. Some of the courtesy lamps are also used as reading lamps, each reading lamp may be manually turned on or off using it's own respective switch

Sep 24, 2015 | Oldsmobile Cars & Trucks

1 Answer

How do I fix my 99 blazer the dome lights won't turn on and the 4 who drive won't light up or work


In the instrument panel fuse box fuse # 8 CTSY LP 10A ,that's for the dome lights, fuse panel is left side of IP. What are you talking about 4 who drive won't light up or work ? 4 wheel drive ? Do you have two speed automatic or two speed selectable ?
Switch Indicator Lamps Do Not Light - One or More ? Check fuse #15 IP fuse box 10A 4WD . This is for two speed auto !

Circuit Description

The indicator lamps circuits consist of 5 individual lamps contained inside the mode/range switch assembly, they are AUTO, 4WD, 2HI, 4HI, 4LO and NEUTRAL. The AUTO, 4WD, 2HI, 4HI, and 4LO lamps are contained inside their respective range button. When the ignition is ON, the transfer case shift control module illuminates the indicator lamp that corresponds to the current ATC gear position by providing a ground through a current limiting driver.
The transfer case shift control module flashes each indicator lamp after a shift has been requested and will continue to flash until the transfer case shift control module can complete the shift. After a shift to AUTO, 4WD, 2HI, 4HI, or 4LO is made, the transfer case shift control module will flash that indicator lamp until the transfer case shift control module receives a high voltage signal on CKT 1695 from the front axle switch.
A solid state circuit located inside the switch supplies ignition voltage to the lamps. The solid state circuit also receives voltage whenever the headlamp switch is in park or headlamp position. When the solid state circuit receives voltage from the headlamp switch it will reduce the voltage that it supplies to the indicator lamps, dimming the lamps when the headlamps are ON.

Feb 07, 2015 | Cars & Trucks

1 Answer

Where is the fuse for the sunroof on a 2002 Tahoe?


Ignition power comes from the 25A PWR WDO circuit breaker in the right I/P fuse block. The 15A CTSY LP FUSE in the underhood fuse block is the source of battery power.

Aug 18, 2014 | 2002 Chevrolet Tahoe

1 Answer

Electrical draw CTSY FUSE


I wonder if the buzzing is coming from the key switch ? (ignition ) . CTSY is always HOT ! you need a wire diagram to see where CTSY wires travel to & from to isolate this draw . I found that the CTSY 20amp fuse is also wired to the parking lights 20A fuse @ fuse block . start there, check all wires, grounds to parking lamps, and switch, it might be your headlight switch thats causing your problem ! replace it and see what happens !

Mar 23, 2013 | 1998 GMC Sierra

2 Answers

'93 buick century battery drain


unhook hot wire to alt at night if batt is up the next morning it is the alt

Jan 03, 2013 | 1993 Buick Century

1 Answer

01 Suburban battery draining


take it to an autosparky ......They will check to see if there is a drain on the battery.
cheapest and fastest option.

Jun 26, 2009 | 2001 Chevrolet Suburban

1 Answer

My 1990 Olds Cutlass Calais is missing the fuse box cover and therefore has no diagram for fuse placement. Is one available online? Copy I can print or just refer to in order to replace correct fuses?


I have always had a place in my heart for the Olds Cutlass. I own a '90 Olds Cutlass Calais--WITH the fuse box COVER. I went out to the car and removed the cover and have it next to me so that I can type the EXACT fuse order as they appear on the inside cover.There are 2 col. When I've finished the l/h side, I'll make a line to indicate the start of the r/h side. I will also put the Circuit on the left & fuse on the right. If you are ready, HERE WE GO:
-----CIRCUIT----------------------------------FUSE------
Air Cond/Heater HTR A/C
Audio Alarm CTSY LPS/GAGES
Driver Info System CLK-CIG/GAGES
Cigar. Lighter CLK-CIG
Clock (Radio) CLK-CIG
Cruise Control RADIO (LD2/LG7)
ECM RLYS (L68)
Eng Controls ECM RLYS
Eng Cooling Fan HTR A/C
Fuel Injection F/P INJ
Fuel Pump F/P INJ
Horn CLK-CIG
Ignition IGN
Instrumentation GAGES
Light-Lic Plate TAIL LPS
Light-Underhood TAIL LPS
Light-Glove Box CLK-CIG
Lights-Backup TURN B/U
______END OF 1ST HALF FUSE DIAGRAM______
-----CIRCUIT-----------------------------------FUSE-----
Lights-Brake STOP HAZ
Lights-Courtesy/Intr CTSY LPS
Lights-Hazard Warning STOP HAZ
Lights-Instrumentation INST LPS
Lights-Park/Side Mkr TAIL LPS
Lights-Tail TAIL LPS
Lights-Turn Signal TURN B/U
Power Antenna CTSY LPS
Power Door Locks CLK-CIG
PWR (CB)
Power Seats PWR (CB)
Power Windows CLK-CIG
PWR WDO (CB)
Radio RADIO
Rear Defogger GAGES
PWR (CB)
Torque Conv Clutch ECM RLYS
Trunk Release HTR A/C
Wiper/Washer WIPER
----------------END OF FUSE DIAGRAM----------------
Did my Best. Let me know if you need anything else. I have shop manual for this Yr, Make & Model. Best of Road to You. How'd I do? Have a Great Day!

Jan 03, 2009 | 1990 Oldsmobile Cutlass Calais

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