Diagnostic System Check

Install scan tool. If scan tool powers up, go to next step. If scan tool does not power up, perform appropriate diagnostic procedure. See SELF-DIAGNOSTIC SYSTEM in appropriate BODY CONTROL MODULES article.
Turn ignition on, engine off. Following scan tool manufacturer's instructions, attempt to establish communication with Platform Zone Module (PZM), Instrument Panel Cluster (IPC) and Powertrain Control Module (PCM). If communication with PZM, IPC and PCM is established, go to next step. If communication with PZM, IPC and PCM is not established, diagnose communication problem with class 2 device. See SELF-DIAGNOSTIC SYSTEM in appropriate BODY CONTROL MODULES article.
Select display DTC function for PZM, IPC and PCM . Record all displayed DTCs, status of displayed DTCs and module that set the DTC. If DTCs are displayed, go to next step. If no DTCs are displayed, diagnose by symptom. See SYMPTOM TESTS .
Retrieve DTCs and perform appropriate test. See DIAGNOSTIC TROUBLE CODE INDEX table.

DIAGNOSTIC TROUBLE CODE INDEX

DTC

Description

B1327, B1328, B1556, B1558, B1981

⁽¹⁾

PASS-Key(R) II Open/Shorted Pellet

PASS-Key(R) II Open/Shorted Pellet After Good Key

CTD Trunk Tamper Switch Fault

Wrong Resistor Before Good

Wrong Resistor After Good

PASS-Key(R) II Pellet Resistance Not Programmed

Key Code/Password Corrupted In Memory

UXXXX

⁽²⁾

⁽¹⁾	See appropriate BODY CONTROL MODULES article.

⁽²⁾	For any DTC beginning with the letter "U", diagnose communication problem with class 2 device. See SELF-DIAGNOSTIC SYSTEM in appropriate BODY CONTROL MODULES article.