LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2007 >> STS V >> Repair and Diagnosis >> External Pages >> Different car >> Section 660 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B1025-B1125 >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

WARNING: This page is about a different car, the 2013 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 and X2 connectors at the amplifier.
  2. Radio ON, test for less than 1 volt between the appropriate signal circuit terminal listed below and ground:
    • Left front tweeter speaker output (+) - terminal 4 X2
    • Left front tweeter speaker output (-) - terminal 5 X2
    • Right front tweeter speaker output (+) - terminal 7 X2
    • Right front tweeter speaker output (-) - terminal 6 X2
    • Left rear speaker output (+) - terminal 16 X2
    • Left rear speaker output (-) - terminal 8 X2
    • Right rear speaker output (+) - terminal 15 X2
    • Right rear speaker output (-) - terminal 14 X2
    • Front center speaker output (+) - terminal 13 X2
    • Front center speaker output (-) - terminal 12 X2
    • Left rear subwoofer speaker output (+) - terminal 5 X1
    • Left rear subwoofer speaker output (-) - terminal 6 X1
    • Right front speaker output (+) - terminal 7 X1
    • Right front speaker output (-) - terminal 3 X1
    • Left front speaker output (+) - terminal 1 X1
    • Left front speaker output (-) - terminal 2 X1
    • Right front speaker output (+) - terminal 7 X1
    • Right front speaker output (-) - terminal 3 X1
    • Left rear midrange speaker output (+) - terminal 11 X2
    • Left rear midrange speaker output (-) - terminal 10 X2
    • If greater than the specified range, test both circuits of the affected speaker for a short to voltage.
  3. Radio ON, test for greater than 1 ohm between the appropriate signal circuit terminal listed below and ground:
    • Left front tweeter speaker output (+) - terminal 4 X2
    • Left front tweeter speaker output (-) - terminal 5 X2
    • Right front tweeter speaker output (+) - terminal 7 X2
    • Right front tweeter speaker output (-) - terminal 6 X2
    • Left rear speaker output (+) - terminal 16 X2
    • Left rear speaker output (-) - terminal 8 X2
    • Right rear speaker output (+) - terminal 15 X2
    • Right rear speaker output (-) - terminal 14 X2
    • Front center speaker output (+) - terminal 13 X2
    • Front center speaker output (-) - terminal 12 X2
    • Left rear subwoofer speaker output (+) - terminal 5 X1
    • Left rear subwoofer speaker output (-) - terminal 6 X1
    • Right front speaker output (+) - terminal 7 X1
    • Right front speaker output (-) - terminal 3 X1
    • Left front speaker output (+) - terminal 1 X1
    • Left front speaker output (-) - terminal 2 X1
    • Right front speaker output (+) - terminal 7 X1
    • Right front speaker output (-) - terminal 3 X1
    • Left rear midrange speaker output (+) - terminal 11 X2
    • Left rear midrange speaker output (-) - terminal 10 X2
    • If less than the specified range, test both circuits of the affected speaker for a short to ground.
  4. If all circuits test normal, reconnect all harness connectors at the amplifier.
  5. Ignition ON, radio ON, disconnect the appropriate speaker.
  6. Test for 5.0-7.5 volts between the signal circuit terminals and ground.
    • If less then the specified range test the circuit for an open/high resistance. If the circuit tests normal, replace the amplifier.
  7. If the circuit tests normal, test or replace the appropriate speaker.
scientia non olet · About LEMON Manuals