Symptom Related Diagnostic Procedures

Diagnostic Chart:

Wiring Diagram:

Chart Test Description:
1. This test determines if the Class 2 data bus itself is malfunctioning.
2. This test checks for a short to ground in CKT 1807(PPL).
3. This test checks for a short to voltage in CKT 1807 (PPL).
4. This test starts a process to determine which module is causing the Class 2 data bus to stop communicating.
5. This test determines if the scan tool is malfunctioning or CKT 1807 (PPL) is open.
6. This test determines which module is causing the Class 2 data bus to stop communicating. The modules on the Class 2 data bus must be reconnected in the following order (for this test):
A. Body Control Module (PZM)
B. Remote Function Actuator (RFA)
C. Instrument Panel Cluster (IPC)
D. Sensing Diagnostic Module (SDM)
E. Electronic Brake Traction Control Module (EBTCM)
F. Powertrain Control Module (PCM)
G. Heater and A/C Programmer (ACM)
H. Amplifier (if equipped)
I. Electronic Suspension Module
J. Radio (IRC)
K. Memory Seat Module (MSM) (if equipped)
L. Cellular Phone Module (if equipped)
M. Memory Mirror Module (MMM) (if equipped)
N. Climate Control Panel (CCP) (if equipped)