Circuit/System Testing

WARNING: This page is about a different car, the 2020 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

FTB 11, 12, 13, 2B

NOTE:

More than one speaker may be connected to each signal circuit in a parallel configuration. Make sure to disconnect all speakers on the signal circuit.

Ignition OFF, disconnect the appropriate P19 Speaker (s):
- DTC B1960 = P19 Speaker (s) connected to circuit 201
- DTC B1961 = P19 Speaker (s) connected to circuit 200
- DTC B1962 = P19 Speaker (s) connected to circuit 199
- DTC B1963 = P19 Speaker (s) connected to circuit 46
Ignition ON, infotainment system ON, mute OFF.
Test for 5-7 V between the signal circuit terminal 2 and ground.
- If less than 5 V
1. Test the appropriate circuit for a short to ground:
  - DTC B1960 = Circuit 201
  - DTC B1961 = Circuit 200
  - DTC B1962 = Circuit 199
  - DTC B1963 = Circuit 46
  - If a short to ground is found, repair the circuit fault.
  - Go to next step: If a short to ground is not found
2. Test the appropriate circuit for an open/high resistance:
  - DTC B1960 = Circuit 201
  - DTC B1961 = Circuit 200
  - DTC B1962 = Circuit 199
  - DTC B1963 = Circuit 46
  - If an open/high resistance is found, repair the circuit fault.
  - Go to next step: If an open/high resistance is not found
3. Replace the T3 Audio Amplifier
- If greater than 7 V
1. Test the appropriate circuit for a short to voltage:
  - DTC B1960 = Circuit 201
  - DTC B1961 = Circuit 200
  - DTC B1962 = Circuit 199
  - DTC B1963 = Circuit 46
  - If a short to voltage is found, repair the circuit fault.
  - Go to next step: If a short to voltage is not found
2. Replace the T3 Audio Amplifier
- Go to next step: If between 5-7 V
Test for 5-7 V between the signal circuit terminal 1 and ground.
- If less than 5 V
1. Test the appropriate circuit for a short to ground:
  - DTC B1960 = Circuit 118
  - DTC B1961 = Circuit 117
  - DTC B1962 = Circuit 116
  - DTC B1963 = Circuit 115
  - If a short to ground is found, repair the circuit fault.
  - Go to next step: If a short to ground is not found
2. Test the appropriate circuit for an open/high resistance:
  - DTC B1960 = Circuit 118
  - DTC B1961 = Circuit 117
  - DTC B1962 = Circuit 116
  - DTC B1963 = Circuit 115
  - If an open/high resistance is found, repair the circuit fault.
  - Go to next step: If an open/high resistance is not found
3. Replace the T3 Audio Amplifier
- If greater than 7 V
1. Test the appropriate circuit for a short to voltage:
  - DTC B1960 = Circuit 118
  - DTC B1961 = Circuit 117
  - DTC B1962 = Circuit 116
  - DTC B1963 = Circuit 115
  - If a short to voltage is found, repair the circuit fault.
  - Go to next step: If a short to voltage is not found
2. Replace the T3 Audio Amplifier
- Go to next step: If between 5-7 V
Disconnect the appropriate harness connector at the T3 Audio Amplifier
Test for infinite resistance between signal circuit terminal 1 and signal circuit terminal 2 at the appropriate P19 Speaker.
- If less than infinite resistance
  Repair the short between the two signal circuits.
- Go to next step: If infinite resistance
Replace the appropriate P19 Speaker.

FTB 28

Ignition ON/Vehicle in Service Mode. Infotainment system ON, mute OFF.
Verify that none of the DTCs listed below are set:
- DTC B1960 2B
- DTC B1961 2B
- DTC B1962 2B
- DTC B1963 2B
- If the DTC is set
1. Clear the DTC.
2. Infotainment system ON, mute OFF.
3. Verify the DTC does not reset.
  - If the DTC resets, replace the T3 Audio Amplifier
  - Go to next step: If the DTC does not reset
4. All OK.
- Go to next step: If the DTC is not set
All OK.