ABS DTC'S 34 OR 35 (POSSIBLY WITH ABS DTCS 27 OR 28)
SUBJECT:
ABS DTCs 34 or 35 (Possibly with ABS DTCs 27 or 28) Set When Driving in the Rain or Through Standing Water (Replace Affected Rear Wheel Speed Sensor Connector)
MODELS AFFECTED:
1996 Saturns equipped with ABS brakes built up to and including:
* VIN TZ265458 - Sedans and Coupes * VIN TZ293500 - Wagons
CONDITION:
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Some vehicles may intermittently set antilock brake system (ABS) diagnostic trouble codes (DTCS) 34 (left rear wheel speed sensor circuit fault) or 35 (right rear wheel speed sensor fault). Also DTC 27 may be set with DTC 34 or DTC 28 may be set with DTC 35. These DTCs may only set while driving in the rain or driving through standing water.
CAUSE:
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Insulation on wires to rear wheel speed sensor(s) may have been chafed or cut when harnesses were built, causing an intermittent short to ground in circuits 884 or 885 for DTC 34, or 882 or 883 for DTC 35. The chafe or cut can be located between 38 to 191 mm (1.5 to 7.5 in.) from the back of the rear wheel speed sensor connector.
CORRECTON:
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Refer to procedures to verify chafe or cut in wiring insulation. If a chafe or cut is found, replace corresponding rear wheel speed sensor connector with connector ABS rear wheel speed sensor kit (P/N 21022284).
PROCEDURES
1. If the DTC is:
a. 34 - Disconnect left rear wheel speed sensor connector. b. 35 - Disconnect right wheel speed sensor connector.
2. Carefully remove conduit from the conduit clamp.
3. Carefully remove the first conduit/harness retainer installed in the lateral link. (It can be removed by compressing the tangs, located under the retainer head.)
4. Open connector strain relief clip located at back of connector.
5. Carefully pull wires from the conduit and inspect for chafed and/or cut wires. (Chafing and/or cuts may be found anywhere between 38 to 191 mm (1.5 to 7.5 in.) from the back of the wheel speed sensor connector.)
IMPORTANT: Inspect opposite wheel speed sensor circuit at the same location for chafed and/or cut insulation, prior to releasing vehicle to customer, and repair if necessary
6. If chafed and/or cut wires are evident, refer to next step. If there is no sign of chafed or cut wires, refer to "1996 Brakes Service Manual" for proper diagnosis.
7. Using the ABS rear wheel speed sensor connector kit (P/N 21022284):
a. Cut the wires from the rear wheel speed sensor connector at 450 mm (17.73 in.) back from the rear wheel speed sensor connector. (This allows use of the full-length of the ABS rear wheel speed sensor connector kit, and will replace any possible corrosion in the wires that may have been caused by the chafed or cut wire acting like a wick, and drawing moisture up the wire, inside the insulation.)
b. Splice the wires using the Saturn approved Packard crimp and seal splices. Use the Salmon/pink color, OTC P/N 217670, found in the Saturn Wire Repair Kit, and stagger the two splices. (Staggering the splices allows the wiring to fit back into the conduit.)
8. Carefully install wiring back into conduit.
9. Wrap electrical tape around chafed area of conduit. Wrap tape 51 to 76 mm (2 to 3 in.) past both sides of chafed area of conduit.
NOTICE: Conduit/wiring harness must be routed exactly as it was before removal and repair. Failure to correctly route conduit may cause damage to the conduit and/or wiring harness.
10. Install conduit/harness retainer into lateral link.
11. Secure connector strain relief clip and connect wheel speed sensor connector to wheel speed sensor.
12. Clear diagnostic trouble codes and verify that condition has been repaired.
PARTS REQUIREMENTS: ------------
21022284 Connector Kit - ABS Rear Wheel Speed Sensor
CLAIM INFORMATION: ------------
To receive credit for this repair during the warranty coverage period, submit a claim through the Saturn Dealer System using the appropriate Electronic Labor Time Guide and Labor Operation Code H2534-Right Rear and/or H2535-Left Side.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.
