Page 27 of 175

1998 Volvo S90
Anti-lock Brake
System (ABS)
If the warning lamp lights up
there is a malfunction of the
ABS system (the standard
braking system will however
function). The vehicle should be
driven to a Volvo retailer for
inspection.
See page 67 for additional
information.
Canadian models are equipped
with this warning light:
Mode "W" engaged
The lamp will light up when the
Winter/Wet mode is engaged.
If the warning lamp begins to
flash,this means that there is a
fault in the automatic gearbox.
Contact your Volvo retailer.
Supplemental
Restraint System
If the light comes on (or stays
on after the vehicle has started),
the SRS diagnostic system has
detected a fault. Drive to an
authorized Volvo retailer for an
inspection of the system. See
the SRS section for more
information.
Service reminder
indicator
This light will come on at
10,000 mile (16,000 km)
intervals. It is a reminder to the
driver that the 10,000 mile
(16,000 km) service interval has
been exceeded. The light will
stay on 2 minutes after start
until reset by the servicing
retailer.
Coolant level sensor
If the light comes on while
driving, the coolant level is low.
The coolant level in the
expansion tank should be
checked immediately and
topped off if necessary. The
cooling system should be
inspected by an authorized
Volvo retailer.
Turn signal indicators-
trailer (certain models)
When towing a trailer, this light
will flash simultaneously with
the turn signals on the trailer. If
the light does not flash when
signaling, neither the trailer's turn
signals nor the car's turn signals
are functioning.
Bulb failure warning
light
The light will come on if any of
the following bulbs are defective:
one of the low beam headlights
one of the tail lights
one of the brake lights when the
brake pedal is depressed.
Check the fuse and bulb.
See sections titled "Replacing
bulbs" and "Fuses".
Lighting, Turn signals pg. 20
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Page 28 of 175

1998 Volvo S90
Headlights and parking lights
All lights off *
Parking lights on **
Headlights and parking lights are on if
starting (ignition) switch is in position I or II. If
the headlight switch is in position
all lights
will go out when starting switch is switched off.
With the headlight switch in position
the
parking lights will stay on (headlights off) with
the daytime running light switch (A) in position
.
The high beams can only be switched on if the
headlight switch is in position
.
Switch from high to low beams, and vice versa,
by moving the turn signal switch lever on the left
side of the steering column towards the steering
wheel.
*Models equipped with daytime running lights:
The low beams, tail lights, parking lights and
license plate lights will come on automatically
when the ignition is switched on.
Automatic daytime running lights
NOTE: The daytime running light function may
only be disabled (turned off) in the U.S. -
Canadian law mandates the use of daytime
running lights.
Screw A in the illustration (available on U.S.
models only) is used to control the automatic
daytime running lights when the headlight switch
is in position 0. To adjust, press in the screw with
a small screwdriver and turn to one of the
following positions:
Automatic daytime
running lights
Automatic daytime
running lights
** The daytime running
lights will also function when
the headlight switch is in
Turn signals
1 Lane change position: In maneuvers such as
lane changing, the driver can flash the turn signals
by moving the turn signal lever to the first stop
and holding it there. The lever will return to the
neutral position when released.
2 Signal lever engaged for normal turns
3 High beam/low beam switch (headlights on)
Move the lever towards the steering wheel and
release it.
Headlight flasher (headlights off)
Move the lever towards the steering wheel.
The headlight high beam will be on until the lever
is released.
NOTE:Defective turn signal bulbs will cause turn
signal indicator and remaining signal lights to
flash more rapidly than normal.
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Page 91 of 175

1998 Volvo S90
Chapter 6 - (cont.)
Replacing bulbs
pg. 81
Replacing bulbs
The method for replacement of bulbs in
the various lighting units is shown on the
following pages. Make sure when
installing bulbs, that the guide pin on the
socket fits into its corresponding recess.
When installing Halogen bulbs, do not
touch the glass with your fingers because
grease, oil or any other impurities can be
carbonized onto the bulb and damage the
reflector.
Use bulbs of correct type and voltage.
Failure to do so could cause the bulb
failure warning light to activate.
NOTE: Turn the ignition and light
switch off before replacing any bulbs.
Headlights (high/low beams)
1. Press the protruding tabs on the plastic
cover and pull out towards the fender.
2. Turn the bulb and connector 1/4 turn
counterclockwise and remove.
3. Remove the connector from the bulb.
4. Press a new bulb into the connector
without touching the bulb itself.
5. Reinsert the bulb into the headlight
housing and turn 1/4 turn clockwise until
the unit seats properly.
6. Reinstall the plastic cover.
Bulb Power US Bulb No.
High beam 70W HB3/9005
Low beam 60W HB4/9006
Headlight adjustment
The height of the headlight beams can be
adjusted according to vehicle load. The
headlights should be re-aimed if heavy
loads are carried in the trunk/cargo area or
rear seat, or when towing a trailer.
To adjust the headlights:
Park the car on a level surface and open
the hood.
The headlights are equipped with a level
which can be seen by looking through the
clear "window" on the top of the headlight
lens.
Turn the height adjustment knob (A) until
the bubble in the level aligns with within
the marking lines on the level.
Lateral headlight adjustment (B) should
only be carried out by an authorized
Volvo retailer. This setting should be
preset to "0".
Replacing bulbs pg. 82
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Page 135 of 175
1998 Volvo S90
Electrical system
12 V, negative ground.
Voltage-controlled generator. Single-wire system
with chassis and engine used as conductors.
Battery
Voltage 12 V
Capacity 600 A/125 min
The battery contains corrosive and poisonous acids.
It is of the utmost importance that old batteries are
disposed of correctly. Your Volvo retailer can assist
you in this matter.
Generator
Rated output 1400 W (certain models: 1680 W)
max. current 120 Amp (certain models: 120 Amp)
Bulbs
Bulb Trade
No. Power
Socket No.
of
bulb
Headlights HBI/9004 65/45 W – 2
Parking
lights,
turn
signals,
front 1157 N.
A.
21/5
W/24/2.2 cp BAY
15
2
turn
signals,
rear 1156
21W/32cp BA
15s 2
Tail lights 2x67 5W/4cp BA
15s 2
Brake
light 1156
21 W/32cp BA
15s 2*
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