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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