[modern] Re: Jim's Brake Pad Warning Light

Jim - that light should only come on when there is a break in one of
the wires or in the pad wear sensor at end of pad life. If you have not
already done so, try taking one of the connectors off your old brake
pads. Cut both wires to remove the sensor end, strip them back and
twist them together. Then go to each wheel and plug in that connector
until you find one that causes your warning light to go off.

Your '89 Jag has sensors on all four wheels (later years do not). If that
doesn’t locate the fault for you, I suppose you could have two bad
connectors, although that is unlikely. Alternatively, one of your leads
to the computer could be bad. I will take look to see if I can tell you
where the wire leads from the wheels go into the warning system.
George Kasten '89 VDP

Jim wrote:>Date: Fri, 22 Oct 1999 23:55:22 EDT

From: JAGOWENS@cs.com
Subject: [modern] Re: Modern Digest V1 #1297
i need help in ms… ,i have a xj40 89 the low brake pad light stays
on …i have replaced front and rear with jag pads, all the connects
looks >good . . . if anyone can help me i would appreicate it, i have
worked on it for a month,??? help in ms. jim

Hi, maybe this connector pinout list will help.

The wire goes from LB135-7 to the wheel sensors and comes back on LB135-34.
The brake pad warning light goes on if one of the wires is grounded or the
circuit is open.

to the computer could be bad. I will take look to see if I can tell you
where the wire leads from the wheels go into the warning system.
George Kasten '89 VDP

Inputs & Outputs, Jaguar XJ40 instrument pack DU-11

Connector-pin I/O Circuit Active Inactive----------------------------------------------------------------------------

LB134-1 IN Fuel usage from ECU Pulsed Signal 0V
LB134-2 IN Ignition Switched Power 12V 0V
LB134-3 IN Logic Ground Ground Ground
LB134-4 IN Logic Ground Ground Ground
LB134-5 OUT Diagnostic Socket Ground Ground
LB134-6 NC/IN VCM Display dimmer 12V 5V
LB134-7 NC 0V
LB134-8 NC 0V
LB134-9 NC 0V
LB134-10 IN Instrument pack lightning 12V 0V
LB134-11 NC 0V
LB134-12 NC 0V
LB134-13 OUT Diagnostic Socket Ground Ground
LB134-14 OUT Diagnostic Socket Ground Ground
LB134-15 IN Road speed sensor signal Pulsed Signal 2.5V
LB134-16 IN Road speed sensor ground 2.5V 2.5V
LB134-17 IN Road speed sensor shield Ground Ground
LB134-18 IN Battery Charge Warning Warning lit: <1.5V Warning off: >13.5V
LB134-19 IN Coolant Temperature Sender Max reading: 0V Min reading: 5V
LB134-20 IN Fuel level sender Max reading: 0V Min reading: 5V
LB134-21 IN Oil pressure sender Max reading: 0V Min reading: 5V
LB134-22 NC 0V
LB134-23 NC 0V
LB134-24 IN Tachometer signal Pulsed Signal 12V

LB135-1 NC 0V
LB135-2 OUT Road speed output Pulsed Signal 5V
LB135-3 NC 0V
LB135-4 NC 0V
LB135-5 NC 0V
LB135-6 NC 0V
LB135-7 OUT Brake pad low 12V 12V
LB135-8 NC/IN Fuse box 4 failure Ground >8V
LB135-9 IN Brake pressure low warning 12V 0V
LB135-10 IN Brake fluid low Ground 12V
LB135-11 IN Brake switch Ground 12V
LB135-12 IN Fuse box 3 failure Ground >8V
LB135-13 IN Washer fluid low warning 12V Ground
LB135-14 IN Gearbox SPORT mode warning Ground 12V
LB135-15 IN Fasten seat belt warning Ground 12V
LB135-16 IN Trunk open warning Ground 12V
LB135-17 IN Park brake on warning Ground 12V
LB135-18 IN Bulb failure 12V Ground
LB135-19 IN ABS failure warning Ground 12V
LB135-20 IN Left rear door open warning Ground 12V
LB135-21 IN Right rear door open warning Ground 12V
LB135-22 IN Fueling fault warning Ground 12V
LB135-23 IN Exhaust temp warning Ground 12V
LB135-24 IN High beam warning Ground 12V
LB135-25 IN Average speed button Ground 12V
LB135-26 IN Average fuel mpg/kmpl button Ground 12V
LB135-27 IN Total fuel used button Ground 12V
LB135-28 IN Trip computer range button Ground 12V
LB135-29 IN Trip memory clear button Ground 12V
LB135-30 IN VCM control button Ground 12V
LB135-31 IN Trip instant fuel usage button Ground 12V
LB135-32 IN Trip total distance button Ground 12V
LB135-33 OUT trip Computer Ground Ground Ground
LB135-34 IN Brake pad low Ground 12V
LB135-35 IN Fuse box 1 failure Ground >8V
LB135-36 IN Fuse box 2 failure Ground >8V
LB135-37 IN Coolant level low warning 12V Ground
LB135-38 IN VCM Display Lightning 12V 0V
LB135-39 IN Trailer turn signal Ground 12V
LB135-40 IN Left turn signal Ground 12V
LB135-41 IN Right turn signal Ground 12V
LB135-42 IN mph/kmh select Ground 12V
LB135-43 IN Bulb failure Ground 12V
LB135-44 IN Transmission fault warning 12V Ground
LB135-45 IN Brake circuit failure 12V Ground
LB135-46 IN Drivers door open warning Ground 12V
LB135-47 IN Passenger door open warning Ground 12V
LB135-48 IN Anti-lock failure warning Ground 12V

Michel
'90 Westminster Blue Sovereign XJ40 (Matska) 256k(km) 161k(miles)
Groningen, the Netherlands