2003 H2 not working
Alarm fob sounds the horn when I click it multiple times so horns work with alarm fob. But steering wheel horn pad does not set horn off. Tester light one end on exposed metal side of hornso ground - and other end on battery red + terminal ...and tester lights up. BUT when Tester light one end is placed on red + battery terminal and other end to power plug for horn...the tester lights up. Why??? Isn't that + to +? Relay is good but when steering wheel horn is pressed relay does not click. Tried to put current through the 30 to 87 in the relay slot and horn does not sound. Tried 3 good relays so relay is not the problem. Fuse also good - tried 3 fuses as well. Tried to put power directly to horn terminals with car battery and horns dont make a sound. Bought 3 sets of horns and also can't get them to make a sound when connected directly to the car battery...what am I doing wrong??? Whats wrong with my horn system???
Cars & Trucks - Hummer - H2 - 2003 Hummer H2
Answers & Comments
Do you have an air bag light lit on the instrument cluster ? Do you have C.C. button's on the steering wheel , do they work ? If the alarm fob (as u call it ) Can make the horns sound , the relay is sending B+ voltage to the horns Don't know how your testing.
System Description
The horn system consists of the following components:
• Horn fuse
• Horn relay
• Horn switch
• Horn(s)
• Body Control Module (BCM)
System Operation
The vehicle horns are activated under the following conditions:
• The horn switch is depressed.
• The body control module (BCM) commands the horns on. The BCM commands the horns on under either of the following conditions:
- When the content theft deterrent system detects a vehicle intrusion. For further information, refer to Content Theft Deterrent (CTD) Description and Operation in Theft Deterrent.
- When the panic button is depressed on the remote control door lock transmitter. For further information, refer to Keyless Entry System Description and Operation in Keyless Entry.
- When the OnStar® system is used to sound the horns, if equipped. For further information, refer to OnStar Description and Operation in Cellular Communications.
- When the keyless entry system is used to lock the vehicle, a horn chirp may sound to notify the driver that the vehicle has been locked. The notification feature may be enabled or disabled through personalization. For further information, refer to Keyless Entry System Description and Operation in Keyless Entry.
Circuit Operation
Battery positive voltage is applied at all times to the horn relay coil and the horn relay switch. Pressing the horn switch applies ground to the horn relay control circuit. The body control module BCM may also apply ground to the horn relay control circuit as described above. When the horn relay control circuit is grounded, the horn relay is energized and battery positive voltage is applied to the horn(s) through the horn control circuit. The horn(s) sound as long as ground is applied to the horn relay control circuit.
Before trying to rig the circuit watch this video an test the way this guy shows https://www.youtube.com/watch?v=Mru8BbTG...