IK0400056

IK0400056 - 07 and Newer Brake Light Operation on HPV with Full Power Brakes
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Countries:
CANADA, UNITED STATES Document ID: IK0400056
Availability:
ISIS, Bus ISIS, FleetISIS
Revision:
2
Major System:
BRAKES
Created:
1/9/2009
Current Language: English
Last Modified: 1/15/2013
Other Languages: Français, Español,
Author:
Viewed:
Joe Christopher
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Title: 07 and Newer Brake Light Operation on HPV with Full Power Brakes
Applies To: HPV Brake Light Full Power Brakes
DESCRIPTION
12 volts is at pin 2 of brake switch connector (4037), when brakes are applied voltage passes thru brake switch
connector (4037) out of pin 1 to Full Power Brake connector (9511) pin 10, when Full Power Brake ECU sees this voltage
is sends ground signal from Full Power connector (9511) pin 3 to Body Controller connector (1602) pin E14 which drops
the circuit close to zero volts, This circuit without brakes applied will have 10 volts (+/- 1.5 v). When Body Controller sees
voltage drop at connector (1602) pin E14 it will turn on the brake lights.
SYMPTOMS


Brake lights stay on
Brake lights not working
POSSIBLE DIAGNOSTIC TROUBLE CODES
DTC
597 0
597 1
597 2
597 7
MODULE
Body Controller
Body Controller
Body Controller
Body Controller
DESCRIPTION
Brake Switch reading above normal range
Brake Switch reading below normal range
Brake Switch inputs do not match
Brake Switch stuck open or closed
PARTS INFORMATION
Part #
Description
Qty.
2587201C91
Brake Switch
1
SIGNALS TO WATCH
Brake Analog Switch Raw Signal - 1602 Pin E14
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IK0400056 - 07 and Newer Brake Light Operation on HPV with Full Power Brakes
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TROUBLESHOOTING
1. Check at brake switch (4037) pin 2 for 12 volts (if voltage is low or missing check for short or open on circuit A94BF/M94BF)
2. When brakes applied check at brake switch (4037) pin 1 for 12 volts (if voltage is lower than 10 volts or missing then replace brake switch)
3. When brakes applied check at Full Power ECU connector (9511) pin 10 for 12 volts (if voltage lower than 10 volts or missing then check
circuit A90B/N90B for short or open circuit)
4. When brakes not applied check at Body Controller connector (1602) pin E14 for 10 volts (if voltage missing make sure accesory, ignition
and main power circuit to body controller are good, also check circuit N90F/A90F for short to ground)
5. When brakes applied check at Body Controller connector (1602) pin E14 for close to 0 volts (if voltage is 2 volts or higher check circuit
N90F/A90F for short to power)
CIRCUIT DIAGRAMS
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IK0400056 - 07 and Newer Brake Light Operation on HPV with Full Power Brakes
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Copyright © 2013 Navistar, Inc.
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