00 cv horn diag

7/31/2019 00 CV Horn Diag

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000 Crown Victoria/Grand Marquis Workshop Manual

ECTION 413-06: Horn 2000 Crown Victoria/Grand Marquis Workshop Manual

IAGNOSIS AND TESTING Procedure revision date: 06/21/1999

orn

efer to Wiring Diagrams Cell 44, Horn/Cigar Lighter/Clock for schematic and connectorformation.

Special Tool(s)

73 Digital Multimeter orequivalent105-R0051

nspection and Verification

1. Verify the customer concern by operating the system.

2. Visually inspect for the following obvious signs of mechanical or electrical damage.

isual I nspect ion Chart

Mechanical Elect r ical

Verify that the horn retaining bolt

is tight Verify that the horns are not

touching surrounding sheet metalor other components

Damaged steering wheel pad hornswitch (part of driver side air bagmodule [043B13])

Blown fuse:

battery junction box (BJB) Fuse 5(15A) Damaged wiring harness Damaged horn relay

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3. If the fault is not visually evident, verify the symptom and refer to the Symptom Cha

ympt om Chart

Symptom Chart

Condit ion Possible Sources Act ion

The horn does notsound

BJB Fuse 5 (15A). Circuitry. Horn relay. Steering wheel pad

horn switch (part ofdriver side air bagmodule).

Horn. Speed control

servo. Steering wheel

switch harness. Air bag sliding

contact (14A664).

GO to Pinpoint

Test A.

The horn soundscontinuously

Lighting controlmodule (LCM).

Horn relay. Circuitry. Steering wheel pad

horn switch (part ofdriver side air bagmodule).

Air bag sliding

contact. Steering wheel

switch harness.

GO to PinpointTest B.

npoint Tests

http://www.fordtechservice.dealerconnection.com/pubs/content/~WSYA/~MUS~LEN/20/SYAD6003.HTM#Ahttp://www.fordtechservice.dealerconnection.com/pubs/content/~WSYA/~MUS~LEN/20/SYAD6003.HTM#Ahttp://www.fordtechservice.dealerconnection.com/pubs/content/~WSYA/~MUS~LEN/20/SYAD6003.HTM#Bhttp://www.fordtechservice.dealerconnection.com/pubs/content/~WSYA/~MUS~LEN/20/SYAD6003.HTM#Bhttp://www.fordtechservice.dealerconnection.com/pubs/content/~WSYA/~MUS~LEN/20/SYAD6003.HTM#Bhttp://www.fordtechservice.dealerconnection.com/pubs/content/~WSYA/~MUS~LEN/20/SYAD6003.HTM#Bhttp://www.fordtechservice.dealerconnection.com/pubs/content/~WSYA/~MUS~LEN/20/SYAD6003.HTM#Ahttp://www.fordtechservice.dealerconnection.com/pubs/content/~WSYA/~MUS~LEN/20/SYAD6003.HTM#A


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NPOI NT TEST A: THE HORN DOES NOT SOUND

CONDI TI ONS DETAI LS/ RESULTS/ ACTI ONS

A1 CHECK ANTI-THEFT SYSTEM OPERATION (IF EQUIPPED)

NOTE: If the vehicle is not equipped with anti-theft, go to Step A2.

Operate the anti-theft panicfeature.

Does t he horn sound?

Yes

GO toA6.

No

GO toA2.

A2 CHECK POWER SUPPLY TO HORN RELAY CIRCUIT 460 (YE/LB)

Horn Relay

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Measure the voltage betweenhorn relay connector Pin 86, Circuit460 (YE/LB), harness side andground; and between horn relayconnector Pin 30, Circuit 460 (YE/LB), harness side and ground.

Are t he volt ages greater

than 10 volt s?

Yes

GO toA3.

No

REPAIR the circuit. TEST thesystem for normal operation.

A3 CHECK HORN RELAYCheck the horn relay; refer to

Wiring Diagrams Cell 149.

I s the horn relay OK?

Yes

GO toA4.

No

INSTALL a new horn relay. TESTthe system for normal operation.

A4 CHECK STEERING WHEEL PAD HORN SWITCH SIGNAL TO HORN RELAY



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Measure the resistance betweenhorn relay connector Pin 85, Circuit1 (DB), harness side and groundunder the following conditions:

Steering

WheelPad

SwitchPosit ion Resist ance

Pressed Less Than 5Ohms

Released Greater Than10,000 Ohms

Are the resistancescorrect?

Yes

GO toA5.

No GO toA6.

A5 CHECK WIRE BETWEEN HORN RELAY AND HORN(S)

Horn C1000



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Measure the resistance betweenhorn relay connector Pin 87, Circuit6 (YE/LG), harness side and hornC1000, Circuit 6 (YE/LG), harnessside.

Measure the resistance betweenhorn relay connector Pin 87, Circuit

6 (YE/LG), harness side andground.

I s t he resistance lessthan 5 ohm s betw eenthe horn relay connectorand the horn connector(s), and greater than

10,000 ohms betw eenthe horn relay connectorand ground?

Yes

INSTALL a new horn. TEST thesystem for normal operation.

No



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A6 CHECK WIRE BETWEEN HORN RELAY AND AIR BAG SLIDING CONTACT CIRCUIT(DB)

Deactivate the air bag system;refer to Section 501-20B.

Air Bag Sliding Contact C283

CM C2026

Measure the resistance between

the air bag sliding contact C283 Pin3, Circuit 1 (DB), harness side andhorn relay connector Pin 85, Circuit1 (DB), harness side.

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Measure the resistance betweenLCM C2026 Pin 4, Circuit 1 (DB),harness side and horn relayconnector Pin 85, Circuit 1 (DB),harness side.

Are the resistances less

than 5 ohms?

Yes

GO toA7.

No


A7 CHECK AIR BAG SLIDING CONTACT

Disconnect the steering wheelswitch harness from the air bagsliding contact.

Measure the resistance betweenupper air bag sliding contactconnector Pin 5 (DB) (component

side), and air bag sliding contactC283 Pin 8 (DB) (component side).

http://www.fordtechservice.dealerconnection.com/pubs/content/~WSYA/~MUS~LEN/20/SYAD6003.HTM#a7http://www.fordtechservice.dealerconnection.com/pubs/content/~WSYA/~MUS~LEN/20/SYAD6003.HTM#a7


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Measure the resistance betweenupper air bag sliding contactconnector Pin 4 (BK) (component

side), and air bag sliding contactC283 Pin 1, (DG/OG) (componentside).

Are the resistances lessthan 5 ohms?

Yes

GO toA8.

No

INSTALL a new air bag slidingcontact. REFER to Section 501-

20B. TEST the system for normal

operation.

A8 CHECK STEERING WHEEL SWITCH HARNESS

http://www.fordtechservice.dealerconnection.com/pubs/content/~WSYA/~MUS~LEN/20/SYAD6003.HTM#a8http://www.fordtechservice.dealerconnection.com/renderers/reload_frames.asp?leftside=/pubs/content/~WSYA/~MUS~LEN/25/SYAS1KbL.HTM&rightside=/pubs/content/~WSYA/~MUS~LEN/26/SYAS1KbR.HTM&contenttype=WORKSHOP&workunit=SYA&market=US&language=EN&viewer=IEhttp://www.fordtechservice.dealerconnection.com/renderers/reload_frames.asp?leftside=/pubs/content/~WSYA/~MUS~LEN/25/SYAS1KbL.HTM&rightside=/pubs/content/~WSYA/~MUS~LEN/26/SYAS1KbR.HTM&contenttype=WORKSHOP&workunit=SYA&market=US&language=EN&viewer=IEhttp://www.fordtechservice.dealerconnection.com/renderers/reload_frames.asp?leftside=/pubs/content/~WSYA/~MUS~LEN/25/SYAS1KbL.HTM&rightside=/pubs/content/~WSYA/~MUS~LEN/26/SYAS1KbR.HTM&contenttype=WORKSHOP&workunit=SYA&market=US&language=EN&viewer=IEhttp://www.fordtechservice.dealerconnection.com/renderers/reload_frames.asp?leftside=/pubs/content/~WSYA/~MUS~LEN/25/SYAS1KbL.HTM&rightside=/pubs/content/~WSYA/~MUS~LEN/26/SYAS1KbR.HTM&contenttype=WORKSHOP&workunit=SYA&market=US&language=EN&viewer=IEhttp://www.fordtechservice.dealerconnection.com/pubs/content/~WSYA/~MUS~LEN/20/SYAD6003.HTM#a8


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Measure the resistance of theDB wire between the steeringwheel pad horn switch connectorharness side and steering wheelswitch harness connector Pin 5(DB) harness side.

Measure the resistance of theBK wire between the steering

wheel pad horn switch connectorharness side and steering wheelswitch harness connector Pin 4(BK) harness side.

Are the resistances lessthan 5 ohms?

Yes

GO toA9.

No

INSTALL a new steering wheelswitch harness. TEST the systemfor normal operation.

A9 CHECK STEERING WHEEL PAD HORN SWITCH

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Measure the resistance betweenthe horn pad switch connector Pin1 and Pin 2 under the followingconditions:

Steering

WheelPad Horn

SwitchPosit ion Resist ance

Pressed Less Than 5Ohms

Released Greater Than10,000 Ohms

Are the resistancescorrect?

Yes

GO toA10.

No INSTALL a new driver side air bagmodule. REFER to Section 501-

20B. TEST the system for normal

operation.

A10 CHECK WIRE BETWEEN AIR BAG SLIDING CONTACT AND SPEED CONTROL SERVO CIRCUIT 848 (DG/OG)

peed Control Servo C234

http://www.fordtechservice.dealerconnection.com/pubs/content/~WSYA/~MUS~LEN/20/SYAD6003.HTM#a10http://www.fordtechservice.dealerconnection.com/renderers/reload_frames.asp?leftside=/pubs/content/~WSYA/~MUS~LEN/25/SYAS1KbL.HTM&rightside=/pubs/content/~WSYA/~MUS~LEN/26/SYAS1KbR.HTM&contenttype=WORKSHOP&workunit=SYA&market=US&language=EN&viewer=IEhttp://www.fordtechservice.dealerconnection.com/renderers/reload_frames.asp?leftside=/pubs/content/~WSYA/~MUS~LEN/25/SYAS1KbL.HTM&rightside=/pubs/content/~WSYA/~MUS~LEN/26/SYAS1KbR.HTM&contenttype=WORKSHOP&workunit=SYA&market=US&language=EN&viewer=IEhttp://www.fordtechservice.dealerconnection.com/renderers/reload_frames.asp?leftside=/pubs/content/~WSYA/~MUS~LEN/25/SYAS1KbL.HTM&rightside=/pubs/content/~WSYA/~MUS~LEN/26/SYAS1KbR.HTM&contenttype=WORKSHOP&workunit=SYA&market=US&language=EN&viewer=IEhttp://www.fordtechservice.dealerconnection.com/renderers/reload_frames.asp?leftside=/pubs/content/~WSYA/~MUS~LEN/25/SYAS1KbL.HTM&rightside=/pubs/content/~WSYA/~MUS~LEN/26/SYAS1KbR.HTM&contenttype=WORKSHOP&workunit=SYA&market=US&language=EN&viewer=IEhttp://www.fordtechservice.dealerconnection.com/pubs/content/~WSYA/~MUS~LEN/20/SYAD6003.HTM#a10


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Measure the resistance betweenair bag sliding contact C283 Pin 1,Circuit 848 (DG/OG), harness sideand speed control servo C234 Pin6, Circuit 848 (DG/OG) harnessside.

I s t he resistance less

than 5 ohms?

Yes

GO toA11.

No


A11 CHECK SPEED CONTROL SERVO GROUND CIRCUIT 676 (PK/OG)

Measure the resistance betweenspeed control servo C234 Pin 10,Circuit 676 (PK/OG), harness sideand ground.



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I s t he resistance lessthan 5 ohms?

Yes

INSTALL a new speed controlservo. REFER to Section 310-03.

TEST the system for normaloperation.

No


NPOI NT TEST B: THE HORN SOUNDS CONTI NUOUSLY

CONDI TI ONS DETAI LS/ RESULTS/ ACTI ONS

B1 CHECK HORN CIRCUIT 6 (YE/LG) FOR SHORT TO BATTERY

Horn Relay

Does t he horn continue t o sound?

Yes

REPAIR the circuit. TEST the system for normal operation.

No

GO to B2.

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B2 CHECK HORN RELAY

Check the horn relay; refer to Wiring Diagrams Cell 149

I s the horn relay OK?

YesREINSTALL the horn relay. GO to B3 .

No

INSTALL a new horn relay. TEST the system for normaloperation.

B3 CHECK CIRCUIT 6 (YE/LG)

Air Bag Sliding Contact C283


Yes

GO to B4.

No

RECONNECT air bag sliding contact C283. GO to B5 .

B4 CHECK THE LIGHTING CONTROL MODULE (LCM)

CM C2026

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Yes

REPAIR Circuit 1 (DB) for short to ground. TEST thesystem for normal operation.

No INSTALL a new lighting control module (LCM). REFER toSection 419-10. TEST the system for normal operation.

B5 CHECK AIR BAG SLIDING CONTACT

Deactivate the air bag system; refer to Section 501-20B.

Disconnect the steering wheel switch harness from theair bag sliding contact.


Yes

INSTALL a new air bag sliding contact. REFER to Section

501-20B. TEST the system for normal operation.

No

GO to B6.

B6 CHECK STEERING WHEEL SWITCH HARNESS

Visually inspect the steering wheel switch harness forshort or damage.

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I s the steering w heel sw it ch harness OK?

Yes

INSTALL a new driver side air bag module. REFER toSection 501-20B. TEST the system for normal operation.

No

INSTALL a new steering wheel switch harness. TEST thesystem for normal operation.
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00 cv horn diag

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