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Acura RL (1996-2004 year). Manual - part 505

Diagnostic Trouble Code (DTC)

Symptom-to-System Chart

DTC

MAIN

SUB

No DTC

—

DIAGNOSIS/

SYMPTOM

ABS indicator light does not come on when ignition switch is
turned ON (II)

ABS indicator light does not go off after engine is
started (No DTC)

Pump motor over-run

Pump motor

High-pressure leakage

Pressure switch

High-pressure system

Parking brake

Pulser

Different diameter tire

Wheel sensor

Rear wheel lock

Fail-safe relay

Solenoid

ABS function

CPU comparison

IC (Integrated Circuit)

DIAGNOSTIC

PERIOD

INITIA

DIAGNOSI

INDIVIDUA

DIAGNOSI

REGULA

DIAGNOSI

PROBLEM
LOCATION

Right-front

Left-front

Right-rear

Left-rear

Right-front

Left-front

Right-rear

Left-rear

Right/Left

Right

Left

Front/Rear

Front

Rear

Right-front

Left-front

Rear

REFER

PAGE

Main Menu

Table of Contents

Troubleshooting

ABS Indicator Light Does Not Come On

The ABS indicator light does not come on when the ignition switch is turned ON

When the ignition switch is turned ON (II), the ABS indicator light drive transistor in the ABS control unit is activated by

self-bias and turns the ABS indicator light on.
Possible causes for an ABS indicator light that does not come on:

Blown METER (15 A) fuse or METER (7.5 A) fuse

Meter relay stuck OFF

Open circuit between the METER (15 A) fuse and ABS indicator light

Open circuit between the METER (7.5 A) fuse and body ground

Blown ABS indicator light bulb
Open circuit between the ABS indicator light and ABS control unit

Open circuit between the ABS control unit and body ground

Poor body ground
Faulty ABS control unit

The ABS indicator light does not
come on when the ignition switch

is turned ON (II).

Check the METER (15 A) fuse
in the under-hood fuse/relay box
and the METER (7.5 A) fuse in the

under-dash fuse/realy box.

NOTE: If the brake system light comes on, the

circuit between the battery and gauge assem-

bly is OK.

Are the fuses OK?

Replace the fuse and recheck.

NOTE: Reinstall the fuses if they are OK.

GAUGE ASSEMBLY 22P CONNECTOR

Check for an open in the IG1 cir-
cuit:

1. Disconnect the gauge assem-

bly 22P connector.

2. Turn the ignition switch ON (II).
3. Measure the voltage between

the gauge assembly 22P con-

nector terminal No. 22 and
body ground.

Is there battery voltage?

Meter relay stuck OFF.
Repair open in the wire between

the METER (15 A) fuse in the
under-hood fuse/relay box and
gauge assembly.

Repair open in the wire between

the METER (7.5 A) fuse in the

under-dash fuse/relay box and
body ground.
Replace the under-hood fuse/
relay box or under-dash fuse/
relay box. (Open circuit inside
the fuse/relay box)

Wire side of female terminals

Is the bulb OK?

Replace the ABS indicator light
bulb.

(To page

19-44

)

Check the ABS indicator light bulb

in the gauge assembly.

Main Menu

Table of Contents

Troubleshooting

ABS Indicator Light Does Not Come On (cont'd)

(From page

19-43

)

Check the gauge assembly:

1. Connect the gauge assembly

22P connector.

2. Connect the gauge assembly

30P connector terminal No. 22
to body ground with a jumper
wire.

Does the ABS indicator light
come on?

Check for an open in the WARN
circuit:

1. Turn the ignition switch OFF.

2. Disconnect the ABS control

unit 22P and 26P connectors.

3. Turn the ignition switch ON (II).
4. Connect the ABS control unit

22P connector terminal No. 20
or 26P connector terminal No.
24 to body ground with a
jumper wire.

Does the ABS indicator light
come on?

Check for an open in the L-GND

circuit:

1. Connect the ABS control unit

22P and 26P connectors.

2. Connect the ABS control unit

22P connector terminal No. 22
or 26P connector terminal No.
26 to body ground with a
jumper wire.

Does the ABS indicator light
come on?

GAUGE ASSEMBLY 30P CONNECTOR

Replace the printed circuit board
in the gauge assembly.

Repair open in the wire between
the gauge assembly and ABS con-
trol unit.

Repair open in the two wires
between the ABS control unit
and body ground.
Repair poor ground (G 404).

Wire side of female terminals

ABS CONTROL UNIT 22P CONNECTOR

Wire side of female terminals

JUMPER
WIRE

ABS CONTROL UNIT 26P CONNECTOR

JUMPER WIRE

Check for loose ABS control unit
connectors. If necessary, substi-
tute a known-good ABS control
unit and recheck.

Main Menu

Table of Contents

ABS Indicator Light Does Not Go Off (No DTC)

The ABS indicator light does not go off after the engine is started

When no problem is found during the initial diagnosis, the ABS control unit turns the ABS indicator light drive transistor

off to turn the ABS indicator light off.
Possible causes for an ABS indicator light that does not go off, but no Diagnostic Trouble Code (DTC) is indicated:

Blown R/C MIRROR (7.5 A) fuse
Open circuit between the under-dash fuse/relay box and ABS control unit

Open circuit between the battery and under-hood fuse/relay box
Blown ABS B2 (15 A) fuse
Open circuit inside the under-hood fuse/relay box
Open circuit between the under-hood fuse/relay box and ABS control unit

Faulty alternator
Open circuit between the alternator and ABS control unit
Short to body ground in the WARN circuit between the ABS indicator light and ABS control unit
Faulty ABS control unit

With engine running, ABS
indicator light is ON.
With the SCS service connec-
tor connected (see page

19-40

no DTC is indicated.

Check the charging system:
Start the engine and check the
charging system indicator light.

Does it go off?

Check the IG2 power source fuse:

1. Turn the ignition switch OFF.

2. Check the R/C MIRROR (7.5 A)

fuse in the under-dash fuse/

relay box.

Is the fuse OK?

Check the ABS B2 (15 A) fuse in
the under-hood fuse/relay box.