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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.)

BME090366900204

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 car-navigation unit

  - Car-navigation unit malfunction
  - Malfunction in wiring harness between car navigation unit and TNS relay

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1* | • Turn headlight switch on. • Measure voltage at the following terminal of car-navigation unit connector (24-pin):

  - Terminal 1E (TNS (+) signal)

• Is voltage 10 V or more?
Yes
Replace car navigation unit (available at Clarion service center) or get it repaired at Clarion service center, then go to next step.
No | Repair wiring harness between car navigation 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.