Grand Prix V6-191 3.1L (1989)
Technical Service Bulletin # 93813
Date: 930301
Optical Steering Wheel Control - New Tool & Diagnosis
Bulletin Number: 93-8-13
Reference Number: 318102
Publish Date: 3/93
Subject:
INFORMATION ON NEW SERVICE TOOL AND ENHANCED DIAGNOSTICS FOR OPTICAL REDUNDANT
Models Affected:
1989-91 6000, 1989-91 BONNEVILLE,
1993 TRANS SPORT
1989-93 GRAND PRIX MODELS
Tool Description
A new essential tool (J37608-92) was released in November of 1992 for all Pontiac dealerships. The new tool consists of three individual jumper
harnesses that work in conjunction with the Steering Wheel Control Adapter (J37608). The tools mentioned above are used in diagnosing Optical
Steering Wheel Control (SWC) systems. They are not used for Analog SWC systems.
The purpose of the new tools is to allow for isolation of the different Optical SWC components. The purpose of each tool:
J37608 (Steering Wheel Control Adapter) - This tool can connect (to the cancel cam assembly, E & C Interface Module) in parallel to the Cancel Cam
Assembly, the E & C Interface Module, the Turn Signal Switch, and the SWC head or keypad. It allows for voltage measurements to be taken on any of
the SWC power, ground, illumination, or data lines.
J37608-92A (Jumper Harness) - This jumper harness connects to the vehicle connector that plugs into the E & C Interface Module. This allows for
Battery, Ground, and the E & C Data line (CKT 835) to be connected to the SWC Adapter; which can power up the SWC head or keypad and the E & C
Interface module. Thus, the Cancel Cam Assembly and Turn Signal Switch can be bypassed and allow for testing of the E & C Interface Module and the
SWC head or keypad.
J37608-92B (Jumper Harness) - This jumper harness allows Data In and Data Out messages to be sent without the Cancel Cam Assembly and the Turn
Signal Switch in the system. When bypassing these components, if the SWC problem disappears; a problem exists with either the Cancel Cam Assembly
or the Turn Signal Switch. If the problem remains, the fault is due to one of the remaining SWC components.
J37608-92C (Jumper Harness) - This jumper harness has a connector similar to the Data Link Connector (DLC) which the TECH 1 can be connected to
and a ground wire which provides proper grounding of the TECH 1. The TECH 1 is used to monitor Entertainment & Comfort (E & C) data messages
that are sent from the SWC head, SWC keypad, HVAC head and the Radio or to simulate the SWC head or keypad by sending messages through the
SWC components.
Use the new diagnostic information included here in place of that found in Section 8A-89 in the Service Manual.
The following updated information applies to the Sound Service Audio Systems Diagnostics Guide.
When using the Sound Service Audio Systems Diagnostics Guide to diagnose optical Steering Wheel Control complaints:
Refer to pages (5-43 - 5-53) for the symptom table and diagnostic charts.
Refer to pages (5-54 - 5-56) for jumper harness connection instructions.
Refer to pages (2-17 - 2-20) for component and circuit descriptions.
Revisions to the Delco Electronics Sound Service Audio Systems Diagnostics Guide.
Important:
To avoid misdiagnosis, after selecting the appropriate symptom from the symptom table, refer to these revisions for the appropriate chart.
All Charts
Before replacing any SWC components, check for poor connections or bent terminals.
Chart 1 SWC Head Illumination does not come on with Park lights or Headlights
The Turn Signal Switch (TSS) illumination wire should be checked by measuring the voltage to ground at the TSS illumination spring loaded brush. If
11 or more volts are not present; replace the TSS. If 11 or more volts are present, perform Cancel Cam checks as listed. If OK, replace the Cancel Cam.
