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Component Tests: Clock

  1. Inspect the clock circuit. See CLOCK CIRCUIT  under CIRCUIT TESTS.
  2. If the passenger seat belt warning light does not light up or the clock will not operate, go to next step. If the clock loses or gains time, go to step  4.
  3. Check that the battery positive voltage is 10-16 volts. If the voltage is not as specified, replace the battery. Check that the DOME and RAD NO. 2 fuses are not blown. See Fig 1. If the fuse is blown, replace the fuse and check for a short. Inspect the connector on the wiring harness side. Trouble shoot the clock as follows:
    • If there is battery positive voltage between terminal +B and body ground, go to the next step. If there is not battery voltage, the +B circuit in the wiring harness is faulty.
    • If there is battery positive voltage between terminal ACC and body ground, go to the next step. If there is not battery voltage, the ACC circuit in the wiring harness is faulty.
    • If there is battery positive voltage between terminal GND and body ground, go to the next step. If there is not battery voltage, the ground circuit in the wiring harness is faulty.
    • Replace the clock. See REMOVAL & INSTALLATION article under INSTRUMENT PANEL in ACCESSORIES & EQUIPMENT.
  4. Check that the battery positive voltage is 10-16 volts. If the voltage is not as specified, replace the battery. Inspect the error of the clock. The allowable error (per day) is -1.5 to 1.5 seconds. If the error exceeds the allowable error, replace the clock. Check if the clock adjusting button is sticking in position and has failed to return. If the error exceeds the allowable error, replace the clock. Inspect the connector on the wiring harness side. Trouble shoot the connector on the wiring harness side as follows:
    • If there is battery positive voltage between terminal +B and body ground. If the voltage is less than 10 volts, locate cause and repair, or recharge the battery. If the voltage is not less than 10 volts, go to the next step.
    • If there is battery positive voltage between terminal ACC and body ground. If the voltage is less than 10 volts, locate cause and repair, or recharge the battery. If the voltage is not less than 10 volts, go to the next step.
    • Adjust or replace the clock. For clock replacement procedure, see REMOVAL & INSTALLATION article under INSTRUMENT PANEL article.
Fig 1: Identifying Clock Assembly Circuit Wiring Diagram & Connector
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