Slipring Chart
TOOL TERMINAL VOLTAGE1. A to ground. 1. Battery voltage at all wheel positions.
2. A to D. 2. Battery voltage at all wheel positions.
3. B to D. 3. Battery voltage at all wheel positions when headlights or parking lights are on and I/P lighting is at maximum brightness.
Fig. 1 Cancel Cam:
Fig. 2 Cancel Cam and LED's (Back Side):
Fig. 3 Receptors & Turn Signal Switch Contacts:
If battery voltage is not present, or if it varies or "flutters" during any of the above checks, remove the cancel cam (see Figures 1 and 2). To access the cancel cam, remove the upper steering shaft nut, steering wheel, cover, retaining ring and shaft lock plate. See Section 3B4 for removal procedures. Inspect the sliprings (Figure 2) on the cancel cam, and the contacts and springs in the turn signal switch (see Figure 3). Replace these parts as necessary. Incorrect or missing lubricant on the cancel cam will cause premature failure. The correct lubricant is Part No. 26002312. Take care to keep the lubricant (or any foreign matter) away from the LED's and receptors, as it will hinder or prevent proper operation.
OPTICAL/SLIPRING TEST 2
All checks in this test are to be made with connector C214 still connected, with the IGN switch in the RUN or ACCY position, and with the cancel cam, turn signal switch and shaft lock in place. Use a conventional analog voltmeter for voltage checks.
A. Backprobe connector C214 terminal A [ORN (917) wire] to ground (do not press any control head buttons during this test). If voltage is between 4.5 and 5.5 volts, go to Step B. If not, inspect/replace turn signal switch (see Figure 3). Turn signal switch replacement procedures are in Section 3B4.
B. Backprobe connector C214 terminal A [ORN (917) wire] to ground while pressing all three of either "Preset, Mute and Recall" buttons or "Seek, Scan, and AM/FM" buttons at once. Turn the steering wheel
slowly while measuring. If voltage is between 2.0 and 3.0 volts at all wheel positions, check ORN (917) wiring to radio. If wiring is OK, send radio to an AC-Delco Repair Station. If voltage is not always between 2.0 and 3.0 volts, go to Step C.
FIGURE 4 - J-35630 TOOL USAGE:
C. Using tool J-35630 connected between connector C1 on the cancel cam and the control head (see Figure 4), measure voltage from tool terminal C to ground while pressing all three of either "Preset, Mute, and Recall" buttons or "Seek, Scan, and AM/FM" buttons at once. Turn the steering wheel slowly while measuring. If the voltage is between 3.0 and 4.5 volts at all wheel positions, go to Step D. If not, repair/replace control head.
To perform the checks in Step D, the cancel cam must be removed. To access the cancel cam, remove the upper steering shaft nut, steering wheel, cover, retaining ring and shaft lock plate. See Section 3B4 for removal procedures. The turn signal switch receptors must be shielded from outside light during this test. Use a large dark cloth, jacket, or similar item to shield the switch and receptors from lights.
Fig. 3 Receptors & Turn Signal Switch Contacts:
FIGURE 6 - CONNECTOR C214 (TERMINALS):
Fig. 7 - Slip Rings and Connector C1 (Cancel Cam):
1. Remove the cancel cam, and direct a flashlight beam at the turn signal switch receptors (see Figure 3). Measure the voltage to ground at Pin A of connector C214 (see Figure 6).
- If the voltage is 5 volts when the switch and receptors are in darkness and drops to 0 volts when in the flashlight
beam, the slipring is at fault. Replace the cancel cam/slipring.
- if the voltage remains at 5 volts when in the flashlight beam, replace the turn signal switch.
REMOTE CONTROL SYSTEM TEST
The checks in this test are to be performed with the IGN switch in the RUN or ACCY position, with connector C214 still connected. Use a digital voltmeter for all voltage checks. Backprobe connector C214 Pin A [ORN (917) wire] to ground while pressing all three of either 'Preset, Mute, and Recall' buttons or 'Seek, Scan, and AM/FM' buttons at once. If the voltage drops from approximately 5.0 to 2.5 volts when either group of three buttons is pressed, the control head is good. Check ORN (917) wire and radio. If the voltage does not drop from approximately 5.0 to 2.5 volts when either group of three buttons is pressed, repair/replace control head.