Check Starter Buzzer
engine
Description
The Buzzer circuit is shorted or open, and the unit gives alarm only.
Activation Conditions
The Buzzer (B) circuit is shorted or open. (The Buzzer output from the microprocessor [PCM-23 to 3MM15] is negative, so the circuit will not be shorted to ground, but is shorted either within the Buzzer itself, or to a positive wire.)
Unit Behavior
Alarm only. NOTE
Reset Conditions
Auto reset when Buzzer amp draw is normal, or alarm may be manually reset using the display mounted keys or by turning the unit off, then back on again.
Corrective Actions
1. Check Buzzer a. Inspect Buzzer and wire connections. No damage to buzzer. No damage or corrosion. b. Check resistance of buzzer. Cannot be opened (infinite ohms) or shorted (zero ohms). c. Use Component Test mode (Refer to Section 1.2.4) to test actual current draw of the circuit. Buzzer provides audible signal. View current draw in Component Test mode screen. Verify the actual current is within the specifications. 2. Check Buzzer Wiring Inspect PCM sub-harness connector pins and terminals. (See wiring schematic Section 1.) Verify there is no physical damage to harness, and no damage, moisture, or corrosion in connectors. 3. Is the component functioning? Are there additional alarms? a. If the component is functioning, and additional alarms are present (often within 3MM01 - 3MM12 or 3MM13 - 3MM18) check related fuses, wires, and connectors. b. If the fuses/wires/connectors are OK, it indicates an internal problem with the MM or the PCM. Download data and replace main microprocessor. For complete Main Microprocessor Module replacement instructions refer to Section 1.5.2. c. If problem persists reinstall the old MM, and replace the PCM. Refer to Section 1.9.16.