Code B338

LOSS OF CHIME/VOICE SERIAL DATA

Circuit Description:
This code will only occur if the vehicle is equipped with the optional Voice Module. If the vehicle is not equipped with a Voice Module and the code sets, replace the EE PROM. The code will set if the Voice Module loses +12 volts or ground, or there is a double open in the 800 CKT. An open CKT 553 will also cause the code to set, as this circuit is used by the voice module to signal the BCM that it has received and responded to a command. All terminal contacts should be checked prior to replacing any parts.

Test Description: The following numbered steps correspond with the step numbers on the diagnostic chart.

CODE B338LOSS OF CHIME/VOICE SERIAL DATA:

1. Step checks for power and ground source up to the module. The test light should be "ON" for both terminals.
2. Checks for +7 volts up to the module.
3. If all power and ground sources are good, faulty terminal contacts should be checked prior to part replacement. The C/V module can only receive serial data and uses CKT 553 to respond to the BCM.
4. It is assumed that both ground circuits would not be open, so fault must be loss of + 12 volts.