Mercedes-Benz Sprinter 2003

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TABLE OF CONTENTS

1.0 INTRODUCTION .........................................................1

1.1 SYSTEM COVERAGE ...............................................1

1.2 SIX-STEP TROUBLESHOOTING PROCEDURE ..........................1

2.0 IDENTIFICATION OF SYSTEM .............................................1

3.0 SYSTEM DESCRIPTION AND FUNCTIONAL OPERATION ......................1

3.1 AIRBAG SYSTEM ...................................................1

3.1.1 DRIVER AIRBAG............................................2

3.1.2 CLOCKSPRING.............................................3

3.1.3 PASSENGER AIRBAG .......................................3

3.1.4 SEAT BELT TENSIONERS....................................3

3.1.5 SPECIAL TOOLS............................................3

3.1.6 DIAGNOSTIC TROUBLE CODES ..............................4

3.1.6.1 ACTIVE CODES ............................................4

3.1.6.2 STORED CODES ...........................................4

3.2 COMMUNICATION ..................................................4

3.2.1 COMMUNICATION K-LINES ..................................4

3.2.2 CANBUS..................................................5

3.3 HEATING & A/C SYSTEM ............................................5

3.3.1 AUTOMATIC TEMPERATURE CONTROL (ATC) ..................5

3.3.1.1 SYSTEM CONTROLS........................................5

3.3.1.2 SYSTEM DIAGNOSTICS .....................................5

3.3.2 CABIN HEATER MODULE (CHM) & HEATER BOOSTER MODULE

(HBM).....................................................7

3.3.2.1 SYSTEM DESCRIPTION .....................................7

3.3.2.2 VENTING THE HEATER’S EXHAUST...........................8

3.3.2.3 SYSTEM DIAGNOSTICS .....................................8

3.4 INSTRUMENT CLUSTER.............................................9

3.5 POWER DOOR LOCKS/RKE ..........................................9

3.5.1. CENTRAL LOCKING.........................................9

3.5.2 REMOTE KEYLESS ENTRY (RKE).............................9

3.5.3 AUTO DOOR LOCKS .......................................10

3.5.4 ACCIDENT RESPONSE.....................................10

3.6 VEHICLE THEFT SECURITY SYSTEM (VTSS) ..........................10

3.7 USING THE DRBIIIT ................................................11

3.8 DRBIIIT ERROR MESSAGES.........................................11

3.9 DRBIIIT DOES NOT POWER UP (BLANK SCREEN)......................11

3.10 DISPLAY IS NOT VISIBLE ...........................................11

4.0 DISCLAIMERS, SAFETY, WARNINGS ......................................11

4.1 DISCLAIMERS.....................................................11

4.2 SAFETY ..........................................................11

4.2.1 TECHNICIAN SAFETY INFORMATION .........................11

4.2.2 VEHICLE PREPARATION FOR TESTING.......................12

4.2.3 SERVICING SUB-ASSEMBLIES ..............................12

4.2.4 DRBIIIT SAFETY INFORMATION .............................12

4.3 WARNINGS .......................................................12

4.3.1 VEHICLE DAMAGE WARNINGS ..............................12

4.3.2 ROAD TESTING A COMPLAINT VEHICLE......................12

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Summary

Introduction

Six-Step Troubleshooting Procedure

Diagnosis of the body system is done in six basic steps: verification of complaint, verification of any related symptoms, symptom analysis, problem isolation, repair of isolated problem, verification of proper operation.

System Description and Functional Operation

Airbag System

The Sprinter Airbag System contains the following components: Airbag Control Module (ACM), Airbag Warning Indicator (SRS), Driver Airbags, Clockspring, Passenger Airbag, Driver Seat Belt Tensioners, Passenger Seat Belt Tensioners.

Driver Airbag

The airbag protective trim cover is the most visible part of the driver side airbag system. The airbag is mounted directly to the steering wheel.

Passenger Airbag

The Passenger Airbag is optional equipment. When supplied with the proper electrical signal the passenger airbag inflator discharges the gas directly into the cushion.

Seat Belt Tensioners

Diagnostic Trouble Codes

Airbag diagnostic trouble codes consist of active and stored codes. If more than one code exists, diagnostic priority should be given to the active codes.