Skip to content
Tahoe / Yukon Service Manual

DTC B192B

Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptors DTC B192B Siren Control For symptom byte information, refer to Symptom Byte List. Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
B+ 1 1 1 —
Serial Data U1522 1 U1522 —
Ground — 1 — —
1. Content theft deterrent alarm inoperative

Circuit/System Description The content theft deterrent system uses the content theft deterrent alarm to provide an audible alert when in the alarm mode. The content theft deterrent alarm receives a constant B+ and ground. The body control module commands the content theft deterrent alarm via serial data. The content theft deterrent alarm is also equipped with a battery backup. If it is disconnected while the ignition is OFF, the battery backup will allow the content theft deterrent alarm to sound the audible content theft deterrent alert. Reference Information Schematic Reference Theft Deterrent System Schematics Connector End View Reference Master Electrical Component List Description and Operation Theft Systems Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the P25 Content Theft Deterrent Alarm. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 1 and ground. ⇒ If 10 Ω or greater 2.1. Ignition OFF. 2.2. Test for less than 2 Ω in the ground circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, repair the open/high resistance in the ground connection. ⇓ If less than 10 Ω
  3. Ignition ON.
  4. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground. ⇒ If the test lamp does not illuminate and the circuit fuse is good 4.1. Ignition OFF. 4.2. Test for less than 2 Ω in the B+ circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse. ⇒ If the test lamp does not illuminate and the circuit fuse is open 4.1. Ignition OFF. 4.2. Test for infinite resistance between the B+ circuit and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇒ If infinite resistance, replace the P25 Content Theft Deterrent Alarm. ⇓ If the test lamp illuminates
  5. Ignition OFF, arm the content theft deterrent system.
  6. Test for greater than 4.5 V between the serial data circuit terminal 2 and ground. ⇒ If 4.5 V or less 6.1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module. 6.2. Test for infinite resistance between the serial data circuit and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇓ If infinite resistance 6.3. Test for less than 2 Ω in the serial data circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, replace the K9 Body Control Module. ⇓ If greater than 4.5 V
  7. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
  8. Test for less than 1 V between the P25 Content Theft Deterrent Alarm serial data circuit terminal 2 and ground. ⇒ If 1 V or greater Repair the short to voltage on the circuit. ⇓ If less than 1 V
  9. Test or replace the P25 Content Theft Deterrent Alarm. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Control Module References for replacement, programming, and setup