DESCRIPTION & OPERATION
| CAUTION | When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery. |
| CAUTION | Static electricity can destroy integrated circuits within instrument cluster. Before servicing, ground yourself and work area to discharge stored electricity. |
FASTEN SAFETY BELTS WARNING ALARM
The FASTEN SAFETY BELTS warning alarm will sound when the following conditions are met simultaneously: the ignition switch is in RUN, BULB TEST or START and the left front safety belt is not fastened. The Audio Alarm Module has a logic circuit which senses whether or not the left front safety belt is fastened. When the left front safety belt is not fastened, voltage sensed at the Audio Alarm Module is high and the alarm will sound for approximately five seconds.
The Audio Alarm Module's FASTEN SAFETY BELT warning alarm also incorporates an indicator within the Instrument Cluster Printed Circuit. The FASTEN SAFETY BELTS indicator works in conjunction with the FASTEN SAFETY BELTS warning alarm. Voltage is applied to the indicator through the GAUGES fuse 4 when the ignition switch is in RUN, BULB TEST or START. The Audio Alarm Module controls the ground path to the indicator. When the Audio Alarm Module receives a signal that the left front safety belt is unfastened, it completes the ground path for the FASTEN SAFETY BELTS indicator.
KEY-IN WARNING ALARM
The Key-In Warning Alarm will sound if the following conditions are met simultaneously: the ignition key must be in the ignition switch with the ignition switch in ACC, LOCK or OFF and the left front door must be open. The Audio Alarm Module incorporates a logic circuit which senses whether or not the conditions are present for activating the alarm. When the ignition key is in the ignition switch and the left front door is open, the Key-In Warning Buzzer Switch is closed as is the Left Door Jamb Switch. When both of these switches are closed, the voltage being monitored at the Audio Alarm Module is low, thus indicating that the conditions are present for activating the Key-In Warning Alarm. The Key-In Warning Alarm will stop sounding if the ignition key is removed from the ignition switch, the left front door is closed or the ignition switch is turned to RUN.
LAMPS-ON WARNING ALARM
The Lamps-ON Warning Alarm will sound if the following conditions are met simultaneously: the Headlamp and Panel Dimmer Switch must be in HEAD or PARK, the Panel Dimmer Switch is not in the fully dim position and the ignition switch must be in LOCK, ACC or OFF position. When the Headlamp and Panel Dimmer Switch is in HEAD or PARK, voltage is applied through the ILLUM fuse 14 to the Audio Alarm Module. When the voltage is sensed at the Lamps ON input terminal of the Audio Alarm Module and there is an absence of voltage at the Ignition ON input terminal, the Lamps-ON Warning Alarm will sound (if the Dimmer Switch is in the Headlamp and Panel Dimmer Switch is positioned at its dimmest setting, then the voltage present at the Lamps-ON input terminal may not be high enough to activate the Lamps-ON Warning Alarm). The Lamps-ON Warning Alarm can be disabled by either turning the Headlamp and Panel Dimmer Switch to OFF or turning the Ignition Switch to RUN.
PRELIMINARY INSPECTION
- Check for open circuits in the following circuits: GAUGES Fuse 4 ILLUM Fuse 14 STOP/HAS Fuse 1 If circuit(s) is/are open, locate and repair overload as necessary and replace fuse(s).
- Check that ground G200 is clean and tight.
- Check FASTEN SAFETY BELTS Indicator for an open filament.
- If all warning alarms are inoperative, then check for an open in Black (150) wire between Convenience Center and ground G200. If circuit is okay, replace Audio Alarm Module.
- Check that Audio Alarm Module is securely mounted in Convenience Center.
- Check that Left Door Jamb Switch operates freely
- Check for a broken or damaged wire inside insulation which could cause system malfunction still prove "GOOD" in a continuity/voltage check with a system disconnected. These circuits may be intermittent or resistive when loaded, and if possible, should be checked by monitoring for a voltage drop with the system operational (under load).
- Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems. If the LAMPS - ON warning is inoperative, check that the Panel Dimmer Switch is not in the fully dim position.
| Component | Location | ||
|---|---|---|---|
| Convenience Center | Under Left Side of Instrument Panel | ||
| Door Jamb Switch, LH Front | At Left Side of Instrument Panel | ||
| Instrument Panel Fuse Block | Lower Left Side of Instrument Panel | ||
| Instrument Cluster | Left Upper End of Instrument Panel | ||
| Seatbelt Retractor Switch | At Driver's Stationary Belt Connector | ||
| Connectors | |||
| C210 | At Convenience Center | ||
| C266 | Left Side of Steering Column, Near Bulkhead | ||
| C298 | Behind Left Side of Instrument Panel, Near Convenience Center | ||
| Ground G200 | Behind Left Side of I/P, Below Fuse Block | ||
| Splices | |||
| S204 | Instrument Panel Harness, Approx. 4 cm. Left of Steering Column Connector Breakout | ||
| S213 | |||
| Crew Cab (VIN [F]) | I/P Harness, Approx. 16 cm. Right of Breakout For Left Door Jamb Switch | ||
| Diesel | I/P Harness, Approx. 16 cm. Right of Headlamp Dimmer Switch Breakout | ||
| All Others | I/P Harness, 16 cm. Right of Fuse Block Breakout | ||
| S217 | |||
| Crew Cab (VIN [F]) | I/P Harness, Approx. 12 cm. Right of Breakout For Left Door Jamb Switch | ||
| Diesel | I/P Harness, Approx. 12 cm. Right of Headlamp Dimmer Switch Breakout | ||
| All Others | I/P Harness, Approx. 12 cm. Right of Fuse Block Breakout | ||
| S226 | Approx. 41 cm. from DERM Connector | ||
| S251 | |||
| Suburban (base only) | Crossbody Harness, 8 cm. Right of Left Door Breakout | ||
| Utility/Crew Cab/Pickup/Extended Cab - Base | Crossbody Harness, 12 cm. Right of Left Door Breakout | ||
| Utility/Crew Cab/Pickup/Extended Cab | Crossbody Harness, 6 cm. Left of Left Seat Breakout | ||
| S259 | |||
| Suburban | Crossbody Harness, 17 cm. Right of Door Lock Relay Breakout | ||
| Utility/Crew Cab/Pickup/Extended Cab | Crossbody Harness, 25 cm. Into Left Seat Breakout | ||
COMPONENT LOCATIONS
Scheme 1
Scheme 2
FASTEN SAFETY BELTS WARNING ALARM OPERATES WHEN BELT IS FASTENED
- Disconnect safety belt retractor switch connector. If FASTEN SAFETY BELTS warning alarm starts, replace safety belt retractor switch. If FASTEN SAFETY BELTS warning alarm continues, check for short to ground in Black/White wire (238) between Safety Belt Retractor Switch Connector and Convenience Center. If circuit is okay, replace Audio Alarm Module.
FASTEN SAFETY BELTS WARNING ALARM INOPERATIVE
- Turn ignition switch to RUN. Remove Audio Alarm Module. Connect test lamp from Pink wire (39) at Convenience Center to ground. If lamp comes on, go to next step. If lamp does not come on, repair open circuit in Pink wire (39) between Convenience Center and Instrument Panel fuse block.
- Fasten seatbelt. Connect test lamp from Audio Alarm Module cavity "K1" to battery voltage. If lamp does not come on, go to next step. If lamp comes on, replace Audio Alarm Module.
- Using test lamp, backprobe Safety Belt Retractor Switch Connector from cavity "B" to battery voltage. If lamp comes on, go to next step. If lamp does not come on, repair open circuit in Black/White wire (238) between Safety Belt Retractor Switch connector and Convenience Center.
- Using test lamp, backprobe Safety Belt Retractor Switch connector from cavity "A" to battery voltage. If lamp comes on, replace Safety Belt Retractor Switch. If lamp does not come on, repair open circuit in Black wire (150) between Safety Belt Retractor Switch and ground.
KEY-IN WARNING ALARM INOPERATIVE
- Remove Audio Alarm Module from Convenience Center. Connect test lamp between Audio Alarm Module cavity "J2" and ground. If lamp comes on, go to next step. If lamp does not come on, repair open circuit in Orange wire (140) between Instrument Panel Fuse Block and Convenience Center.
- Connect test lamp between Audio Alarm Module cavity "K2" and battery voltage. If lamp comes on, go to next step. If lamp does not come on, repair open circuit in Black wire (150) between Convenience Center and ground G200.
- Turn ignition switch to LOCK. Open left front door. Connect test lamp between Audio Alarm Module cavity "J3" and battery voltage. If lamp does not come on, go to next step. If lamp comes on, replace Audio Alarm Module.
- Using test lamp, backprobe Left Door Jamb Switch connector from cavity "C" to battery voltage. If lamp does not come on, go to next step. If lamp comes on, check for open circuit in Light Green wire (80) between Convenience Center and Key-In Warning Buzzer Switch or in Tan wire (159) between Key-In Warning Buzzer Switch and Left Door Jamb Switch. If circuit is okay, replace Key-In Warning Buzzer Switch.
- Using test lamp, backprobe Left Door Jamb Switch connector from cavity "B" to battery voltage. If lamp comes on, replace Left Door Jamb Switch. If lamp does not come on, repair open circuit in Black wire (150) between Left Door Jamb Switch and ground G200.
LAMPS-ON WARNING ALARM INOPERATIVE
- Remove Audio Alarm Module. Turn ignition switch to RUN. Turn headlights switch ON. Connect voltmeter from Pink wire (39) at Convenience Center to ground. If battery voltage is present, go to next step. If no voltage is present, repair open circuit in Pink wire (39) between Convenience Center and Instrument Panel Fuse Block.
- Connect voltmeter between Gray wire (8) at Convenience Center and ground. If battery voltage is present, go to next step. If no voltage is present, repair open in Gray wire (8) between Convenience Center and Instrument Panel Fuse Block.
- Connect test lamp between Audio Alarm Module cavity "K2" and battery voltage. If lamp comes on, replace Audio Alarm Module. If lamp does not come on, repair open circuit in Black wire (150) between Convenience Center and ground G200.
FASTEN SAFETY BELTS INDICATOR INOPERATIVE
- Turn ignition switch to RUN. Leave seatbelt unfastened. If FASTEN SAFETY BELTS warning alarm sounds, go to next step. If FASTEN SAFETY BELTS warning alarm does not sound, go to «FASTEN SAFETY BELTS WARNING ALARM INOPERATIVE»(/gmc/suburban/i-1992-1999/remont/warning-system/#warning-system-audible__fasten-safety-belts-warning-alarm-inoperative) .
- Turn ignition switch to LOCK. Remove Audio Alarm Module from Convenience Center. Connect fused jumper cable from Audio Alarm Module cavity "K3" to ground. Turn ignition switch to RUN. If FASTEN SAFETY BELTS indicator does not come on, go to next step. If FASTEN SAFETY BELTS indicator comes on, replace Audio Alarm Module.
- Using fused jumper cable, backprobe Instrument Cluster Printed Circuit connector from cavity "30" to ground. If FASTEN SAFETY BELTS indicator comes on, repair open circuit in Yellow wire (234) between Convenience Center and Instrument Cluster Printed Circuit. If FASTEN SAFETY BELTS indicator does not come on, check for open circuit in Pink wire (39) between Instrument Panel Fuse Block and Instrument Cluster Printed Circuit. If circuit is okay, replace Instrument Cluster Printed Circuit.
FASTEN SAFETY BELTS INDICATOR IS ON WITH SAFETY BELT FASTENED
- Turn ignition switch to RUN. If FASTEN SAFETY BELTS warning alarm does not sound, go to next step. If FASTEN SAFETY BELTS warning alarm sounds, see «FASTEN SAFETY BELTS WARNING ALARM OPERATES WHEN BELT IS FASTENED»(/gmc/suburban/i-1992-1999/remont/warning-system/#warning-system-audible__fasten-safety-belts-warning-alarm-operates) .
- Remove Audio Alarm Module from Convenience Center. If FASTEN SAFETY BELTS indicator goes out, replace Audio Alarm Module. If FASTEN SAFETY BELTS indicator remains on, check for short to ground in Yellow wire (234) between Convenience Center and Instrument Cluster Printed Circuit. If circuit is okay, replace Instrument Cluster Printed Circuit.
