DTC B15A3-87: Stereo Component Amplifier Missing Message [09/2022 - ]: Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 350, 2024 Lexus ES 300h, 2024 Lexus ES 250, 2023 Lexus ES 350, and 2023 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - POWER SOURCE AND BODY GROUND)
- Disconnect the G11 stereo component amplifier assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition G11-3 (GND) - Body ground Always Below 1 Ω G11-18 (GND2) - Body ground Always Below 1 Ω - Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition G11-1 (+B) - Body ground Always 11 to 14 V G11-16 (+B2) - Body ground Always 11 to 14 V Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 2
- CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)
- Disconnect the G158 radio receiver assembly connector.
- Disconnect the G116 stereo component amplifier assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition G116-2 (MI+) - G158-5 (MO+) Always Below 1 Ω G116-3 (MI-) - G158-6 (MO-) Always Below 1 Ω G116-4 (SLDI) - G158-7 (SLDO) Always Below 1 Ω G116-5 (MO+) - G158-2 (MI+) Always Below 1 Ω G116-6 (MO-) - G158-3 (MI-) Always Below 1 Ω G116-7 (SLDO) - G158-4 (SLDI) Always Below 1 Ω G116-2 (MI+) or G158-5 (MO+) - Body ground Always 10 kΩ or higher G116-3 (MI-) or G158-6 (MO-) - Body ground Always 10 kΩ or higher G116-4 (SLDI) or G158-7 (SLDO) - Body ground Always 10 kΩ or higher G116-5 (MO+) or G158-2 (MI+) - Body ground Always 10 kΩ or higher G116-6 (MO-) or G158-3 (MI-) - Body ground Always 10 kΩ or higher G116-7 (SLDO) or G158-4 (SLDI) - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 3
- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY
- Replace the stereo component amplifier assembly with a new or known good one.
Refer to REMOVAL [09/2022 - ]
Result
Proceed to NEXT
Result:
NEXT
See step 4
- Replace the stereo component amplifier assembly with a new or known good one.
- CHECK FOR DTC
- Clear the DTCs.
Body Electrical > Navigation System > Clear DTCs
- Turn the ignition switch off.
- Turn the ignition switch to ON and wait for 60 seconds.
- Turn the ignition switch off.
- Turn the ignition switch to ON and wait for 60 seconds.
- Check for DTCs and proceed to the following step.
Body Electrical > Navigation System > Trouble Codes
Result
Result Proceed to DTCs are not output A DTC B15A3-87 is output B
Result:
A
END (STEREO COMPONENT AMPLIFIER ASSEMBLY IS DEFECTIVE)
Result:
B
REPLACE RADIO RECEIVER ASSEMBLY. Refer to REMOVAL [09/2022 - ]
- Clear the DTCs.