Check Startup Buzzer
electrical
Description
The Buzzer circuit is shorted or open, and the unit gives an 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
Engine and Electric Operation: Alarm only.
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). 2. Check Buzzer Wiring - Inspect PCM sub-harness connector pins and terminals. (See wiring schematic Section 10.2.) Verify there is no physical damage to harness, and no damage, moisture, or corrosion in connectors. 3. Check Buzzer - Use Component Test mode (Refer to Section 5.2.4) to test actual current draw of the circuit. Buzzer provides audible signal. View current draw in Component Test mode screen. Verify current. .