Mazda 2002 6 - No.3 Even When Headlight Switch Is Turned On, Daytime Screen Does Not Change to Night Time Screen

T–230
TROUBLESHOOTING
Diagnostic procedure
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NO.3 EVEN WHEN HEADLIGHT SWITCH IS TURNED ON, DAYTIME SCREEN DOES NOT CHANGE TO
NIGHT TIME SCREEN. (FRONT AND REAR COMBINATION LIGHTS OPERATE NORMALLY.)
A6E818066000W04
Diagnostic procedure
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AIR BAG SYSTEM
A6E818001046W01
Troubleshooting Index
• Use the chart below verify the symptoms of the trouble in order to diagnose the appropriate area.
STEP INSPECTION ACTION
1 • Disconnect car-navigation unit connector
(16-pin).
• Jack up vehicle and run engine at low speed.
• Measure voltage at the following terminal of
car-navigation unit connector (16-pin):
— Terminal 2H (Vehicle speed signal)
• Is voltage approx. 2.5 V (reference)?
Note
• Vehicle speed signal is in electrical pulses
of approx. 0 V to 5 V.
Yes Replace car-navigation unit (available at Clarion service
center) or get it repaired at Panasonic service center, then
go to Step 4.
No Go to next step.
2* • Disconnect ABS (ABS/TCS) HU/CM
connector (28-pin) or DSC HU/CM connector
(34-pin).
• Is there continuity between car-navigation
unit connector (16-pin) terminal 2H and ABS
(ABS/TCS) HU/CM connector (28-pin)
terminal V, or car-navigation unit connector
(16-pin) terminal 2H and DSC HU/CM
connector (34-pin) terminal AE?
Yes Go to next step.
No Repair wiring harness between car-navigation unit and ABS
(ABS/TCS) HU/CM, or car-navigation unit and DSC HU/CM,
then go to Step 4.
3 • Inspect wiring harness between car-
navigation unit connector (16-pin) terminal
2H and and ABS (ABS/TCS) HU/CM
connector (28-pin) terminal V, or car-
navigation unit connector (16-pin) terminal
2H and DSC HU/CM connector (34-pin)
terminal AE for short to ground.
• Is there short to ground?
Yes Repair wiring harness between car-navigation unit and ABS
(ABS/TCS) HU/CM, or car-navigation unit and DSC HU/CM,
then go to next step.
No Replace instrument cluster, then go to next step.
4 • Does vehicle locator mark operate normally? Yes Complete troubleshooting, then explain repairs to customer.
No Recheck malfunction symptoms, then repeat from Step 1 if
malfunction recurs.
3
Even when headlight switch is turned on, daytime screen does not change to night time screen.
(Front and rear combination lights operate normally.)
TROUBLESHOOTING HINTS
• Malfunction in TNS (+) signal line of LCD unit
— LCD unit malfunction
— Malfunction in wiring harness between LCD unit and TNS relay
STEP INSPECTION ACTION
1* • Turn headlight switch on.
• Measure voltage at the following terminal of
LCD unit connector (24-pin):
— Terminal 1V (TNS (+) signal)
• Is voltage 10 V or more?
Yes Replace LCD unit (available at Panasonic service center) or
get it repaired at Panasonic service center, then go to next
step.
No Repair wiring harness between LCD unit and TNS relay,
then go to next step.
2 • When headlight switch is turned on, does
daytime screen change to night time screen?
Yes Complete troubleshooting, then explain repairs to customer.
No Recheck malfunction symptoms, then repeat from Step 1 if
malfunction recurs.
No. Troubleshooting item Description Page
1
Air bag system warning light does not
illuminate.
Malfunction in air bag system warning
circuit (short to ground).
(See T–231 NO.1 AIR BAG SYSTEM
WARNING LIGHT DOES NOT
ILLUMINATE)