2008 SUZUKI SWIFT vehicle speed signal circuit

Downloaded from www.Manualslib.com manuals search engine Air Conditioning System: Automatic Type 7B-65
DTC Troubleshooting
DTC B1553: CAN Communication Signal MalfunctionS7RS0B7224021
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC B1557: Vehicle Speed Sensor Signal MalfunctionS7RS0B7224022
DTC Detecting Condition and Trouble Area
DTC TroubleshootingStep Action Yes No
1 Serial communication signal data check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Start engine and select “DATA LIST” mode on scan tool.
3) Check “Refrigerant Pressure”, “Vehicle Speed”, “Coolant Temp” and “Outside Air Temp” varies displayed on scan
tool.
Is displayed each va ries described varies in “Scan Tool
Data”? Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
Go to Step 2.
2 Serial communication signal check
1) Connect connectors to BCM and HVAC control module.
2) Using oscilloscope, check that serial communication
signal is outputted referring to “Reference waveform
No.8” of “Inspection of BCM and its Circuits in Section
10B”.
Is serial communication signal outputted at “G37-11”
terminal of BCM connector? HVAC control module
faulty.
BCM (included in
junction block
assembly) faulty.
DTC detecting condition
Trouble area
HVAC control module receives error code fr om BCM continuously.• CAN communication circuit
• BCM (included in junction block assembly)
•ECM
• HVAC control module
Step Action YesNo
1 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check ECM and BCM for DTC.
Is there DTC(s)? Go to applicable DTC
diag. flow.
Substitute a known-
good HVAC control
module and recheck.
DTC detecting condition
Trouble area
HVAC control module receives error code from BCM continuously. • VSS circuit
• VSS
• HVAC control module
Step Action YesNo
1 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check ECM for DTC.
Is there DTC P0500? Go to “DTC P0480: Fan
1 (Radiator Cooling
Fan) Control Circuit in
Section 1A”.
Substitute a known-
good HVAC control
module and recheck.

Downloaded from www.Manualslib.com manuals search engine 9C-11 Instrumentation / Driver Info. / Horn:
Information Display Symptom Diagnosis (If Equipped)S7RS0B9304015
NOTE
This thermometer indicates the ambient temperature in back of front bumper member. Under any one
of the following listed conditions, however, even when the ambient temperature goes up, the
thermometer display does not rise so as to correct the rise of the ambient temperature caused by the
radiant heat of the engine. When the ambient temperature drops, the thermometer reading follows the
change in the temperature.
Be sure to bear this in mind when diagnosing trouble.
• The vehicle speed is 30 km/h (18 mph) or lower.
• Vehicle speed signal is faulty.
• The ignition switch is turned on again within 2 hours.

ConditionPossible cause Correction / Reference Item
No displaying of
information display Circuit fuse Blown
Replace fuse and check for short circuit.
Wiring and/or grounding faulty Repair as necessary.
Information display unit faulty Replace unit.
Incorrect thermometer
display Outside air temperature sensor faulty
Check outside air temperature sensor referring
to “Outside Air Temperature Sensor Inspection
(If Equipped)”.
Vehicle speed signal faulty Check ECM for DTC referring to “DTC Check
in Section 1A”.
Wiring and/or grounding faulty Repair as necessary.
Information display unit faulty Replace unit.
BCM faulty Replace after making sure that none of above
parts is faulty.
Display of thermometer
does not change at –30
°C Outside air temperature is –30
°C (–22
° F) or less —
Outside air temperature sensor faulty Check outside air temperature sensor referring
to “Outside Air Temperature Sensor Inspection
(If Equipped)”.
Information display unit faulty Replace unit.
BCM faulty Replace after making sure that none of above
parts is faulty.
Display of thermometer
does not change at 50
°C Outside air temperature is 50
°C (122
° F) or more —
Outside air temperature sensor faulty Check outside air temperature sensor referring
to “Outside Air Temperature Sensor Inspection
(If Equipped)”.
Information display unit faulty Replace unit.
BCM faulty Replace after making sure that none of above
parts is faulty.
Display of thermometer
does not change at “– – –
°C” Outside air temperature sensor faulty
Check outside air temperature sensor referring
to “Outside Air Temperature Sensor Inspection
(If Equipped)”.
Outside air temperature sensor circuit is
open or short Repair as necessary.
Wiring and/or grounding faulty Repair as necessary.
Information display unit faulty Replace unit.
BCM faulty Replace after making sure that none of above
parts is faulty.

Downloaded from www.Manualslib.com manuals search engine Instrumentation / Driver Info. / Horn: 9C-12
Clock Symptom Diagnosis (If Equipped)S7RS0B9304016
Audio System Symptom Diagnosis (If Equipped)S7RS0B9304017
Radio
NOTE
Electronic part / system with undiagnosed pr oblem may cause electromagnetic interference.
Electromagnetic interference condition may have poor radio reception. To test for presence of
electromagnetic interference in part / system, perform the following procedures.
1. Turn ignition switch to OFF.
2. Systematically disconnect the electronic part / system connector(s) one at a time.
3. Turn ignition switch to ON.
4. Check any improvement in radio reception.

Display of fuel
consumption does not
change at “– – – l / 100 km
(km/l, MPG)” Vehicle is not running (instantaneous
fuel consumption mode)
—
Fuel consumption was reset (average
fuel consumption mo de, if equipped)Vehicle runs for a while.
Vehicle speed signal faulty Check ECM for DTC referring to “DTC Check
in Section 1A”.
Wiring and/or grounding faulty Repair as necessary.
ECM faulty Check input and output signal of ECM referring
to “Inspection of ECM and Its Circuits in
Section 1A”.
Information display unit faulty Replace unit.
BCM faulty Replace after making sure that none of above
parts is faulty.
Condition Possible cause Correction / Reference Item
Condition
Possible cause Correction / Reference Item
No displaying of clock Circuit fuse Blown Replace fuse and check for short circuit.
Wiring and/or grounding faulty Repair as necessary.
Clock unit faulty Replace unit.
ConditionPossible cause Correction / Reference Item
Poor radio reception Out of service area (Poor location) —
Antenna faulty Replace antenna.
Electrical part / system faulty Repair or replace electrical part / system
referring to after-mentioned NOTE.
Wiring and/or grounding faulty Repair as necessary.
Radio assembly faulty Replace radio assembly.
Radio does not operate
and speaker does not
sound Circuit fuse(s) blown
Replace fuse(s) and check for short circuit.
Wiring and/or grounding faulty Repair as necessary.
Radio assembly faulty Replace radio assembly.
Radio does not operate,
but speaker sound Wiring and/or grounding faulty
Repair as necessary.
Radio assembly faulty Replace radio assembly.
Radio is operative, but all
speakers does not sound Wiring and/or grounding faulty
Repair as necessary.
Radio assembly faulty Replace radio assembly.
Individual speaker is
noisy or inoperative Wiring and/or grounding faulty
Repair as necessary.
Speaker faulty Replace speaker.
Radio assembly faulty Replace radio assembly.
Sound quality is poor Out of service area (Poor location) —
Speaker installed incorrectly Install correctly.
Wiring and/or grounding faulty Repair as necessary.
Speaker faulty Replace speaker.
Radio assembly faulty Replace radio assembly.

Downloaded from www.Manualslib.com manuals search engine 9C-13 Instrumentation / Driver Info. / Horn:
CD Player
Auto Volume Control System
Remote Audio Control Switch Symptom Diagnosis (If Equipped)S7RS0B9304018
ConditionPossible cause Correction / Reference Item
CD-ROM does not insert Another CD-ROM already inserted Eject CD-ROM.
Circuit fuse blown Replace fuse and check for short circuit.
Wiring and/or grounding faulty Repair as necessary.
Extraneous material come to be mixed
CD player Clear extraneous material from CD player or
replace radio assembly.
Radio assembly faulty Replace radio assembly.
CD-ROM does not eject Circuit fuse blown Replace fuse and check for short circuit.
Wiring and/or grounding faulty Repair as necessary.
Extraneous material come to be mixed
in CD player Clear extraneous material from CD player or
replace radio assembly.
Radio assembly faulty Replace radio assembly.
CD player does not load
CD-ROM CD-ROM faulty
—
CD-ROM inserted wit h incorrect side upInsert correctly.
Temperature in cabin is too hot —
Water droplets form on internal lens Dry about 1 hour with power on.
Radio assembly faulty Replace radio assembly.
Sound skips or is noisy CD-ROM faulty —
Driving vibration —
Water droplets form on internal lens Dry about 1 hour with power on.
Radio assembly installed incorrectly Install correctly.
Radio assembly faulty Replace radio assembly.
CD player is operative,
but all speakers does not
sound Wiring and/or grounding faulty
Repair as necessary.
Radio assembly faulty Replace radio assembly.
Individual speaker is
noisy or inoperative Wiring and/or grounding faulty
Repair as necessary.
Speaker faulty Replace speaker.
Radio assembly faulty Replace radio assembly.
Sound quality or volume
is poor CD-ROM faulty
—
Wiring and/or grounding faulty Repair as necessary.
Speaker installed incorrectly Install correctly.
Speaker faulty Replace speaker.
ConditionPossible cause Correction / Reference Item
Sound volume does not
vary according to
changes of vehicle speed Auto volume control system is “OFF”
mode
Select auto volume control.
Vehicle speed signal faulty Check vehicle speed signal referring to
“Vehicle Speed Signal Inspection (For Audio
Unit) (If Equipped)”.
Wiring and/or grounding faulty Repair as necessary.
ECM faulty Check input and output signal of ECM referring
to “Inspection of ECM and Its Circuits in
Section 1A”
Radio assembly faulty Replace radio assembly.
ConditionPossible cause Correction / Reference Item
Audio system is
operative, but remote
control switch does not
control audio system Remote audio control switch faulty
Check remote audio control switch referring to
“Remote Audio Control Switch Inspection (If
Equipped)”.
Contact coil faulty Replace contact coil.
Wiring and/or grounding faulty Repair as necessary.
Radio assembly faulty Replace radio assembly.

Downloaded from www.Manualslib.com manuals search engine Instrumentation / Driver Info. / Horn: 9C-22
Remote Audio Control Switch Inspection (If
Equipped)
S7RS0B9306024
1) Remove driver air bag (inflator) module referring to
“Driver Air Bag (Inflator) Module Removal and
Installation in Section 8B”.
2) Disconnect remote audio control switch connector
from contact coil.
3) Check switch for resistance between “a” and “b” terminals under each condition below.
If check result is not satisfactory, replace remote
audio control switch.
Remote audio control switch resistance)
All switches released (OFF): 5119 – 5223 Ω
Switch “1” pushing on (ON): 55 – 57 Ω
Switch “2” pushing on (ON): 129 – 133 Ω
Switch “3” pushing on (ON): 238 – 244 Ω
Switch “4” pushing on (ON): 416 – 426 Ω
Switch “5” pushing on (ON): 743 – 759 Ω
Switch “6” pushing on (ON): 1555 – 1587 Ω
Vehicle Speed Signal Inspection (For Audio
Unit) (If Equipped)
S7RS0B9306025
Check vehicle speed pulse output signal of ECM
referring to “Reference waveform No.32” under
“Inspection of ECM and Its Circuits in Section 1A”
Specifications
Tightening Torque SpecificationsS7RS0B9307001
NOTE
The specified tightening torque is also described in the following.
“Audio System Component Location”

Reference:
For the tightening torque of fastener not specified in this section, refer to “Fasteners Information in Section 0A”.
“b”“a”
1
2
3 4
5
6
I5RW0A930027-01
Fastening part Tightening torque
Note
N ⋅mkgf-mlb-ft
Instrument panel mounting bolt 23 2.3 17.0 )
Antenna base mounting nut 5 0.5 4.0 )