Circuit/System Testing

Without Amplifier (UQ3)

1. Ignition OFF, disconnect the harness connector at the appropriate speaker.
2. Radio ON, test for 5.0-7.5 volts between the speaker circuit terminal A and ground.
   • If greater than the specified range, test the speaker circuit for a short to voltage. If the circuit tests normal, replace the radio.
   • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
3. Test for 5.0-7.5 volts between the speaker circuit terminal B and ground.
   • If greater than the specified range, test the speaker circuit for a short to voltage. If the circuit tests normal, replace the radio.
   • If less than the specified range, test the speaker circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
4. If the vehicle is equipped with UK6 Rear Seat Audio and the concern is with a rear speaker, Test the speaker circuits between the radio and the RSA control.
5. If all circuits test normal, test or replace the speaker.

With Amplifier (UQA/UQS)

1. Ignition OFF, disconnect the X1and X3 harness connectors at the amplifier.
2. Radio ON, Rear Seat Audio OFF, test for 5.0-7.5 volts between the appropriate speaker circuit terminal listed below and ground.

   With UQA

   • Left front speaker control- Connector X2, terminal 4
   • Left front speaker control- Connector X2, terminal 3
   • Right front speaker control - Connector X2, terminal 2
   • Right front speaker control - Connector X2, terminal 1
   • Front center speaker control - Connector X2, terminal 13 (w/ Y91)
   • Front center speaker control - Connector X2, terminal 1 2(w/ Y91)
   • Left subwoofer speaker control- Connector X1, terminal 7
   • Left subwoofer speaker control- Connector X1, terminal 3
   • Right subwoofer speaker control- Connector X1, terminal 2
   • Right subwoofer speaker control- Connector X1, terminal 6

With UQS

• Left front speaker control- Connector X2, terminal 4
• Left front speaker control- Connector X2, terminal 5
• Right front speaker control - Connector X2, terminal 7
• Right front speaker control - Connector X2, terminal 8
• Front center speaker control - Connector X2, terminal 13 (w/ Y91)
• Front center speaker control - Connector X2, terminal 1 2(w/ Y91)
• Left subwoofer speaker control- Connector X1, terminal 1
• Left subwoofer speaker control- Connector X1, terminal 2
• Right subwoofer speaker control- Connector X1, terminal 3
• Right subwoofer speaker control- Connector X1, terminal 7
  • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
  • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
• If all circuits test normal, replace the amplifier.